StealthGas (GASS) 20-F27 Apr 212020 FY Annual report (foreign)Financial data

Company Profile

Cover Page

Cover Page	12 Months Ended
Cover Page	Dec. 31, 2020shares
Document Information [Line Items]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Trading Symbol	GASS
Entity Registrant Name	STEALTHGAS INC.
Entity Central Index Key	0001328919
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	37,858,437
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Document Accounting Standard	U.S. GAAP
Entity Address, Address Line One	331 Kifissias Avenue
Entity Address, Address Line Two	Erithrea 14561
Entity Address, City or Town	Athens
Entity Address, Country	GR
Document Annual Report	true
Document Transition Report	false
Entity File Number	001-36797
Document Shell Company Report	false
Document Registration Statement	false
Title of 12(b) Security	Common Stock
Security Exchange Name	NASDAQ
ICFR Auditor Attestation Flag	true
Entity Address, Postal Zip Code	14561
Entity Incorporation, State or Country Code	1T
Business Contact [Member]
Document Information [Line Items]
Entity Address, Address Line One	331 Kifissias Avenue
Entity Address, Address Line Two	Erithrea 14561
Entity Address, City or Town	Athens
Entity Address, Country	GR
Contact Personnel Name	Harry N. Vafias
Country Region	30
City Area Code	210
Local Phone Number	625 0001
Entity Address, Postal Zip Code	14561

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 38,242,411	$ 68,465,342
Trade and other receivables	3,602,764	4,217,101
Other current assets	309,608	118,246
Claims receivable	120,547	314,217
Inventories	3,687,098	2,447,703
Advances and prepayments	782,125	749,681
Restricted cash	1,308,971	1,589,768
Fair value of derivatives		30,381
Total current assets	48,053,524	77,932,439
Non current assets
Advances for vessel under construction	6,539,115	2,988,903
Operating lease right-of-use assets	0	473,132
Vessels, net	832,335,059	835,152,403
Other receivables	26,427	286,915
Restricted cash	13,488,820	12,065,222
Investments in joint ventures	43,177,657	25,250,173
Deferred finance charges	385,705
Fair value of derivatives		39,744
Total non current assets	895,952,783	876,256,492
Total assets	944,006,307	954,188,931
Current liabilities
Payable to related parties	4,659,861	7,043,121
Trade accounts payable	9,974,751	9,032,690
Accrued liabilities	3,773,499	6,002,079
Operating lease liabilities		473,132
Customer deposits	968,000	968,000
Deferred income	2,995,657	2,843,994
Fair value of derivatives	141,447	37,567
Current portion of long-term debt	40,547,892	40,735,556
Total current liabilities	63,061,107	67,136,139
Non current liabilities
Fair value of derivatives	5,099,464	2,618,250
Long-term debt	311,249,321	325,247,902
Total non current liabilities	316,348,785	327,866,152
Total liabilities	379,409,892	395,002,291
Commitments and contingencies
Stockholders' equity
Capital stock, 5,000,000 preferred shares authorized and zero outstanding with a par value of $0.01 per share, 100,000,000 common shares authorized 44,549,729 shares issued and 39,584,274 shares outstanding at December 31, 2019 and 43,183,684 shares issued and 37,858,437 shares outstanding at December 31, 2020 with a par value of $0.01 per share	431,836	445,496
Treasury stock, 4,965,455 at December 31, 2019 and 5,325,247 shares at December 31, 2020 with a par value of $0.01 per share	(25,373,380)	(24,361,145)
Additional paid-in capital	499,564,087	502,419,122
Retained earnings	94,926,695	82,942,210
Accumulated other comprehensive loss	(4,952,823)	(2,259,043)
Total stockholders' equity	564,596,415	559,186,640
Total liabilities and stockholders' equity	$ 944,006,307	$ 954,188,931

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares outstanding	0	0
Preferred stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	43,183,684	44,549,729
Common stock, shares outstanding	37,858,437	39,584,274
Common stock,par value	$ 0.01	$ 0.01
Treasury stock, shares	5,325,247	4,965,455
Treasury stock, par value	$ 0.01	$ 0.01

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($)	12 Months Ended
Consolidated Statements of Operations - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Revenues	$ 145,003,021	$ 144,259,312	$ 164,330,202
Total revenues	145,003,021	144,259,312	164,330,202
Expenses
Voyage expenses	12,259,795	15,201,978	18,649,258
Voyage expenses – related party	1,799,209	1,788,543	2,037,917
Charter hire expenses	318,606	6,268,988	6,150,780
Vessels' operating expenses	52,344,721	48,619,594	59,920,278
Vessels' operating expenses – related party	950,500	966,500	514,500
Dry-docking costs	3,640,327	1,094,306	3,617,577
Management fees – related party	5,599,351	5,730,910	7,027,195
General and administrative expenses (including $1,294,722, $1,205,683 and $1,084,961 to related party)	2,301,308	3,706,320	3,046,962
Depreciation	37,455,093	37,693,733	41,258,142
Impairment loss	3,857,307	993,916	11,351,821
Net loss on sale of vessels	1,134,854	485,516	763,925
Other operating income			(549,804)
Total expenses	121,661,071	122,550,304	153,788,551
Income from operations	23,341,950	21,709,008	10,541,651
Other (expenses)/income
Interest and finance costs	(14,129,893)	(20,978,065)	(23,286,547)
Gain on deconsolidation of subsidiaries	0	145,000
Loss on derivatives	(50,976)	(107,550)	(11,982)
Interest income and other income	167,794	846,271	587,477
Foreign exchange loss	(54,374)	(8,235)	(107,119)
Other expenses, net	(14,067,449)	(20,102,579)	(22,818,171)
(Loss)/Income before equity in earnings of investees	9,274,501	1,606,429	(12,276,520)
Equity earnings in joint ventures	2,709,984	486,695
Net (Loss)/Income	$ 11,984,485	$ 2,093,124	$ (12,276,520)
(Loss)/Earnings per share
– Basic and diluted	$ 0.31	$ 0.05	$ (0.31)
Weighted average number of shares
– Basic and diluted	38,357,893	39,800,434	39,860,563

Consolidated Statements of Op_2

Consolidated Statements of Operations (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
General and administrative expenses, related party	$ 1,084,961	$ 1,205,683	$ 1,294,722

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss)/Income - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net (loss)/income	$ 11,984,485	$ 2,093,124	$ (12,276,520)
Other comprehensive income
Effective portion of changes in fair value of interest swap contracts	(2,632,826)	(2,848,056)	56,084
Reclassification adjustment	(60,954)	(84,966)
Total other comprehensive income/(loss)	(2,693,780)	(2,933,022)	56,084
Total comprehensive (loss)/income	$ 9,290,705	$ (839,898)	$ (12,220,436)

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($)	Total	Restatement Adjustment [Member]	Capital Stock [Member]	Capital Stock [Member]Restatement Adjustment [Member]	Treasury Stock [Member]	Treasury Stock [Member]Restatement Adjustment [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]Restatement Adjustment [Member]	Retained Earnings [Member]	Retained Earnings [Member]Restatement Adjustment [Member]	Accumulated Other Comprehensive (Loss)/Income [Member]	Accumulated Other Comprehensive (Loss)/Income [Member]Restatement Adjustment [Member]
Beginning balance at Dec. 31, 2017	$ 573,478,772	$ 573,134,591	$ 442,850	$ 442,850	$ (22,523,528)	$ (22,523,528)	$ 501,471,768	$ 501,471,768	$ 93,469,787	$ 93,125,606	$ 617,895	$ 617,895
Balance (in shares) at Dec. 31, 2017			44,285,108	44,285,108	(4,424,545)	(4,424,545)
Issuance of restricted shares and stock based compensation	338,356		$ 2,646				335,710
Issuance of restricted shares and stock based compensation (in shares)			264,621
Cumulative effect of accounting change	(344,181)								(344,181)
Comprehensive income/(loss) for the year	(12,220,436)								(12,276,520)		56,084
Ending balance at Dec. 31, 2018	561,252,511		$ 445,496		$ (22,523,528)		501,807,478		80,849,086		673,979
Ending Balance, (in shares) at Dec. 31, 2018			44,549,729		(4,424,545)
Stock based compensation	611,644						611,644
Stock repurchase	(1,837,617)				$ (1,837,617)
Stock repurchase (in shares)					(540,910)
Comprehensive income/(loss) for the year	(839,898)								2,093,124		(2,933,022)
Ending balance at Dec. 31, 2019	559,186,640		$ 445,496		$ (24,361,145)		502,419,122		82,942,210		(2,259,043)
Ending Balance, (in shares) at Dec. 31, 2019			44,549,729		(4,965,455)
Stock repurchase	(1,012,235)				$ (1,012,235)
Stock repurchase (in shares)					(359,792)
Stock repurchase and cancellation	(2,868,695)		$ (13,660)				(2,855,035)
Stock repurchase and cancellation (in shares)			(1,366,045)
Comprehensive income/(loss) for the year	9,290,705								11,984,485		(2,693,780)
Ending balance at Dec. 31, 2020	$ 564,596,415		$ 431,836		$ (25,373,380)		$ 499,564,087		$ 94,926,695		$ (4,952,823)
Ending Balance, (in shares) at Dec. 31, 2020			43,183,684		(5,325,247)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
Consolidated Statements of Cash Flows - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net (loss)/income for the year	$ 11,984,485	$ 2,093,124	$ (12,276,520)
Adjustments to reconcile net (loss)/income to net cash provided by operating activities:
Depreciation	37,455,093	37,693,733	41,258,142
Amortization of deferred finance charges	698,364	885,191	858,582
Amortization of deferred gain on sale and leaseback of vessels		0	(190,087)
Amortization of operating lease right-of-use assets	473,132	1,572,943
Share based compensation	0	611,644	338,356
Change in fair value of derivatives	(38,561)	255,650	(28,252)
Equity earnings in joint ventures	(2,709,984)	(486,695)
Impairment loss	3,857,307	993,916	11,351,821
Net loss on sale of vessels	1,134,854	485,516	763,925
Gain on deconsolidation of subsidiaries	0	(145,000)
(Increase)/decrease in
Trade and other receivables	874,825	(1,506,590)	531,796
Other current assets	(191,362)	16,055	159,363
Claims receivable	193,670	(1,307,763)	15,951
Inventories	(1,239,395)	617,468	(302,873)
Changes in operating lease liabilities	(473,132)	(1,572,943)
Advances and prepayments	(32,444)	339,858	131,490
Increase/(decrease) in
Balances with related parties	1,617,032	(5,845,771)	(6,278,982)
Trade accounts payable	761,193	(1,316,668)	381,941
Accrued liabilities	(2,403,644)	(217,409)	339,009
Deferred income	151,663	(2,347,660)	755,563
Net cash provided by operating activities	52,113,096	30,818,599	37,809,225
Cash flows from investing activities
Insurance proceeds	0	993,546	0
Proceeds from sale of interests in subsidiaries	0	20,720,975
Vessels' acquisitions and advances for vessels under construction	(48,121,422)	(2,988,903)	(108,295,690)
Proceeds from sale of vessels, net	5,264,768	18,721,123	29,742,788
Investment in joint ventures	(41,998,500)	(11,322,600)
Return of investments from joint ventures	26,781,000	7,363,147
Advances to joint ventures	(29,245)	(5,083,919)
Advances from joint ventures	29,245	5,083,919
Net cash (used in)/provided by investing activities	(58,074,154)	33,487,288	(78,552,902)
Cash flows from financing activities
Stock repurchase	(3,880,930)	(1,837,617)
Deferred finance charges paid	(538,004)	(477,201)	(503,265)
Advances from joint ventures	1,841,380	4,958,250
Advances to joint ventures	(5,841,672)
Customer deposits paid	0	(368,000)	(1,220,700)
Loan repayments	(41,804,846)	(97,371,978)	(56,717,059)
Proceeds from long-term debt	27,105,000	33,480,000	115,712,500
Net cash provided by/(used in) financing activities	(23,119,072)	(61,616,546)	57,271,476
Net increase/(decrease) in cash and cash equivalents	(29,080,130)	2,689,341	16,527,799
Cash and cash equivalents and restricted cash at beginning of year	82,120,332	79,430,991	62,903,192
Cash and cash equivalents and restricted cash at end of year	53,040,202	82,120,332	79,430,991
Cash breakdown
Total cash, cash equivalents and restricted cash shown in the statements of cash flows	53,040,202	82,120,332	79,430,991
Supplemental Cash Flow Information:
Cash paid during the year for interest, net of amounts capitalized	12,905,065	20,768,672	21,087,903
Non cash investing activity – Vessels, net	206,820
Non cash investing activity – Vessels under construction	180,400	$ 63,752	$ 63,752
Non cash financing activity – Deferred finance charges	$ 32,464

Basis of Presentation and Gener

Basis of Presentation and General Information	12 Months Ended
Basis of Presentation and General Information	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and General Information	1. Basis of Presentation and General Information The accompanying consolidated financial statements include the accounts of StealthGas Inc. and its wholly owned subsidiaries (collectively, the “Company”) which, as of December 31, 2020 owned a fleet of thirty seven liquefied petroleum gas (LPG) carriers, three medium range (M.R.) type product carriers and one Aframax tanker providing worldwide marine transportation services under long, medium or short-term charters. StealthGas Inc. was formed under the laws of Marshall Islands on December 22, 2004. The Company’s vessels are managed by Stealth Maritime Corporation S.A. (the “Manager”), a company controlled by members of the family of the Company’s Chief Executive Officer. The Manager, a related party, was incorporated in Liberia and registered in Greece on May 17, 1999 under the provisions of law 89/1967, 378/1968 and article 25 of law 27/75 as amended by article 4 of law 2234/94. (See Note 3). Coronavirus Outbreak: On March 11, 2020, the World Health Organization declared the 2019 Novel Coronavirus (the “2019-nCoV”) outbreak a pandemic. In response to the outbreak, many countries, ports and organizations, including those where the Company conducts a large part of its operations, have implemented measures to combat the outbreak, such as quarantines and travel restrictions, which may continue to cause trade disruptions and volatility in the commodity markets. The Company has experienced and may continue to experience lower LPG rates, as a result of the reduction of the global demand for LPG cargoes and additional costs to effect crew changes. Although to date there has not been any significant effect on the Company’s operating activities due to 2019-nCoV other than the decrease in market rates in 2020, and increased crew cost, the extent to which a new wave of the 2019-nCoV will impact the Company’s results of operations and financial condition will depend on future developments, which are uncertain and cannot be predicted, including among others, new information which may emerge concerning the severity of the virus and the effectiveness of the actions taken to contain or treat its impact or any resurgence or mutation of the virus, the availability and effectiveness of vaccines and their global deployment. Accordingly, an estimate of the future impact cannot be made at this time.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
Significant Accounting Policies	Dec. 31, 2020
Accounting Policies [Abstract]
Significant Accounting Policies	2. Significant Accounting Policies Principles of Consolidation: Use of Estimates: Other Comprehensive Income Foreign Currency Translation: The functional currency of the Company is the U.S. Dollar because the Company’s vessels operate in international shipping markets, which utilize the U.S. Dollar as the functional currency. The accounting books of the Company are maintained in U.S. Dollars. Transactions involving other currencies during the year are converted into U.S. Dollars using the exchange rates in effect at the time of the transactions. At the balance sheet dates, monetary assets and liabilities, which are denominated in other currencies, are translated to reflect the period end exchange rates. Resulting gains or losses are separately reflected in the accompanying consolidated statements of operations. Cash and Cash Equivalents: Restricted Cash: that non-current Trade Receivables: un-collectible Claims Receivable: Inventories: Inventories consist of bunkers (for vessels under voyage charter or on ballast or idle) and lubricants which are stated at the lower of cost and net realizable value. The cost is determined by the first-in, first-out method. The Company considers victualing and stores as being consumed when purchased and, therefore, such costs are expensed when incurred. Advances This represents amounts expended by the Company in accordance with the terms of the construction contracts for vessels as well as other expenses in connection with on-site supervision. In addition, interest costs incurred during the construction (until the asset is substantially complete and ready for its intended use) are capitalized. Vessels Acquisitions: Vessels are stated at cost less depreciation and impairment, if any. Cost consists of the contract price less discounts and any material expenses incurred upon acquisition (initial repairs, improvements, acquisition and expenditures made to prepare the vessel for its initial voyage). Subsequent expenditures for conversions and major improvements are also capitalized when they appreciably extend the life, increase the earning capacity or improve the efficiency or safety of the vessels, or otherwise are charged to expenses as incurred. Where vessels are acquired with existing time charters, the Company allocates the purchase price to the vessels and to the attached time charters on the basis of their relative fair values. The capitalized above-market (assets) and below-market (liabilities) charters are amortized as a reduction and increase, respectively, to revenues over the remaining term of the charter. Impairment or Disposal of Long-lived Assets: Accounting Standards 360-10, 360-10”), for recorded as an impairment loss in the consolidated statements of operations. Various factors including anticipated future charter rates, estimated scrap values, future dry-docking costs and estimated vessel operating costs are included in this analysis. These factors are based on historical trends as well as future expectations. Undiscounted cash flows are determined by considering the revenues from existing charters for those vessels that have long term employment and when there is no charter in place the estimates based on historical average rates. An impairment loss was identified and recorded for the years ended December 31, 2018, 2019 and 2020 (Note 6). Vessels’ Depreciation: The cost of each of the Company’s vessels is depreciated on a straight-line basis over . Assets Held for Sale: 360-10, No Segment Reporting: Accounting for Special Survey and Dry-docking dry-docking Deferred Finance Charges: non-current Accounting for Revenue and Related Expenses: A time charter is a contract for the use of a vessel for a specific period of time and a specified daily charter hire rate, which is generally payable in advance. Operating costs incurred for running the vessel such as crew costs, vessel insurance, repairs and maintenance and lubricants are paid for by the Company under time charter agreements. A time charter generally provides typical warranties and owner protective restrictions. The performance obligations in a time charter are satisfied over the term of the contract beginning when the vessel is delivered to the charterer until it is redelivered back to the owner of the vessel. Some of the Company’s time charters may also contain profit sharing provisions, under which the Company can realize additional revenues in the event that spot rates are higher than the base rates in these time charters. A bareboat charter is a contract in which the vessel owner provides the vessel to the charterer for a fixed period of time at a specified daily rate, which is generally payable in advance, and the charterer generally assumes all risk and costs of operation during the bareboat charter period. The Company’s time charter and bareboat contracts are classified as operating leases pursuant to Accounting Standards Codification (“ASC”) 842 - Leases, and therefore do not fall under the scope of Accounting Standards Codification (“ASC”) 606 because (i) the vessel is an identifiable asset (ii) the owner of the vessel does not have substantive substitution rights and (iii) the charterer has the right to control the use of the vessel during the term of the contract and derives the economic benefits from such use. Time charter and bareboat revenues are recognized when a charter agreement exists, the vessel is made available to the charterer and collection of the related revenue is reasonably assured. Time charter and bareboat charter revenues are recognized as earned on a straight-line basis over the term of the charter as service is provided. Revenues from profit sharing arrangements in time charters are recognized in the period earned. Under time and bareboat charter agreements, all voyages expenses, except commissions are assumed by the charterer. On implementation of ASC 842, the Company, elected to make use of a practical expedient for lessors, not to separate the lease and non-lease non-lease non-lease A voyage charter is a contract, in which the vessel owner undertakes to transport a specific amount and type of cargo on a load port-to-discharge port basis, subject to various cargo handling terms. The Company accounts for a voyage charter when all the following criteria are met: (1) the parties to the contract have approved the contract in the form of a written charter agreement and are committed to perform their respective obligations, (2) the Company can identify each party’s rights regarding the services to be transferred, (3) the Company can identify the payment terms for the services to be transferred, (4) the charter agreement has commercial substance (that is, the risk, timing, or amount of the Company’s future cash flows is expected to change as a result of the contract) and (5) it is probable that the Company will collect substantially all of the consideration to which it will be entitled in exchange for the services that will be transferred to the charterer. The Company determined that its voyage charters consist of a single performance obligation which is met evenly as the voyage progresses and begins to be satisfied once the vessel is ready to load the cargo. The voyage charter party agreement generally has a demurrage clause according to which the charterer reimburses the vessel owner for any potential delays exceeding the allowed lay-time as per the charter party clause at the ports visited which is recorded as demurrage revenue. Revenues from voyage charters are recognized on a straight line basis over the voyage duration which commences once the vessel is ready to load the cargo and terminates upon the completion of the discharge of the cargo. Demurrage revenues are recognized when the amount can be estimated and its collection is probable. In voyage charters, vessel operating and voyage expenses are paid for by the Company. The voyage charters are considered service contracts which fall under the provisions of ASC 606 because the Company retains control over the operations of the vessels such as the routes taken or the vessels’ speed. Deferred income represents cash received for undelivered performance obligations and deferred revenue resulting from straight-line revenue recognition in respect of charter agreements that provide for varying charter rates. The portion of the deferred revenue that will be earned within the next twelve months is classified as current liability and the remaining as long-term liability. Vessel voyage expenses are direct expenses to voyage revenues and primarily consist of brokerage commissions, port expenses, canal dues and bunkers. Brokerage commissions are paid to shipbrokers for their time and efforts for negotiating and arranging charter party agreements on behalf of the Company and expensed over the related charter period and all the other voyage expenses are expensed as incurred except for expenses during the ballast portion of the voyage. Any expenses incurred during the ballast portion of the voyage (period between the contract date and the date of the vessel’s arrival to the load port) such as bunker expenses, canal tolls and port expenses are deferred and are recognized on a straight-line basis, in voyage expenses, over the voyage duration as the Company satisfies the performance obligations under the contract provided these costs are (1) incurred to fulfill a contract that the Company can specifically identify, (2) able to generate or enhance resources of the company that will be used to satisfy performance of the terms of the contract, and (3) expected to be recovered from the charterer. These costs are considered ‘contract fulfillment costs’ and are included in ‘other current assets’ in the accompanying consolidated balance sheets. Vessel operating expenses comprise all expenses relating to the operation of the vessel, including crewing, repairs and maintenance, insurance, stores, lubricants and other operating expenses. Vessel operating expenses are expensed as incurred. Under a bareboat charter, the charterer assumes responsibility for all voyage and vessel operating expenses, dry-docking expenses and risk of operation. Equity Compensation Plan: Share-based compensation includes vested and non-vested shares granted to employees of the Company, to employees of the Manager and to non-employee directors, for their services as directors and is included in General and administrative expenses in the consolidated statements of operations. These shares are measured at their fair value, which is equal to the market value of the Company’s common stock on the grant date. The shares that do not contain any future service vesting conditions are considered vested shares and the total fair value of such shares is recognized in full on the grant date. The shares that contain a time-based service vesting condition are considered non-vested shares on the grant date and a total fair value of such shares is recognized over the vesting period on a straight-line basis over the requisite service period for each separate portion of the award as if the award was, in substance, multiple awards (graded vesting attribution method). The Company accounts for forfeitures as they occur (Note 14). Earnings/(Loss) per Share: two-class Derivatives (i) Hedge Accounting Contracts which meet the strict criteria for hedge accounting are accounted for as cash flow hedges. A cash flow hedge is a hedge of the exposure to variability in cash flows that is attributable to a particular risk associated with a recognized asset or liability, or a highly probable forecasted transaction that could affect profit or loss. The effective portion of the gain or loss on the hedging instrument is recognized directly as a component of “Accumulated other comprehensive income” in equity, while the ineffective portion, if any, is recognized immediately in current period earnings. The Company discontinues cash flow hedge accounting if the hedging instrument expires and it no longer meets the criteria for hedge accounting or designation is revoked by the Company. At that time, any cumulative gain or loss on the hedging instrument recognized in equity is kept in equity until the forecasted transaction occurs. When the forecasted transaction occurs, any cumulative gain or loss on the hedging instrument is recognized in the statement of income. If a hedged transaction is no longer expected to occur, the net cumulative gain or loss recognized in equity is transferred to net profit or loss for the year as a component of “Loss on derivatives”. (ii) Other Derivatives Investments in joint ventures: and the resulting impairment is recorded in the consolidated statements of operations. Recent Accounting Pronouncements : In March 2020, the Financial Accounting Standards Board issued ASU No. 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting (“ASU 2020-04”).” ASU 2020-04 provides temporary optional expedients and exceptions to the guidance in U.S. GAAP on contract modifications and hedge accounting to ease the financial reporting burdens related to the expected market transition from the London Interbank Offered Rate (LIBOR) and other interbank offered rates to alternative reference rates. In January 2021, the FASB issued Accounting Standard Update (“ASU”) 2021-01 (Topic 848), which amends and clarifies the existing accounting standard issued in March 2020 (“ASU”) 2020-04 for Reference Rate Reform. Reference rates such as LIBOR, are widely used in a broad range of financial instruments and other agreements. The ASU permits entities to elect certain optional expedients and exceptions when accounting for derivative contracts and certain hedging relationships affected by changes in the interest rates used for discounting cash flows, for computing variation margin settlements, and for calculating price alignment interest in connection with reference rate reform activities under way in global financial markets (the “discounting transition”). The ASU 2020-04 is effective for adoption at any time between March 12, 2020 and December 31, 2022, for all entities and the ASU 2021-01 is effective for all entities as of January 7, 2021 through December 31, 2022. The Company is currently evaluating the impact of this standard in its consolidated financial statements and related disclosures.

Transactions with Related Parti

Transactions with Related Parties	12 Months Ended
Transactions with Related Parties	Dec. 31, 2020
Related Party Transactions [Abstract]
Transactions with Related Parties	3 . Transactions with Related Parties The Manager provides the vessels with a wide range of shipping services such as chartering, te is charged by the Manager as part of the services is provided by a third party manager) or $125 per vessel operating under a bareboat charter (the “Management fees”) and a brokerage commission of 1.25 The Manager has subcontracted the technical management of some of the vessels to an affiliated ship-management company, Brave Maritime Corp. Inc. (“Brave”). This company provides technical management to the Company’s vessels for a fixed annual fee per vessel which is paid by the Manager. In addition, the Manager arranges for supervision onboard the vessels, when required, by superintendent engineers and when such visits exceed a period of five days in a twelve month period, an amount of $500 is charged for each additional day (the “Superintendent fees”). Effective from 2018, the Manager provides crew management services to some of the Company’s vessels. These services have been subcontracted by the Manager to an affiliated ship-management company, Hellenic Manning Overseas Inc. (ex. Navis Maritime Services Inc.). The Company pays to the Manager a fixed monthly fee of $2,500 per vessel (the “Crew management fees”). The Manager also acts as a sales and purchase broker for the Company in exchange for a commission fee equal to 1% of the gross sale or purchase price of vessels or companies. The commission fees relating to vessels purchased (“Commissions – vessels purchased”) are capitalized to the cost of the vessels as incurred. The commission fees relating to vessels sold (“Commissions – vessels sold”) are included in the consolidated statement of operations. In addition to management services, the Company reimburses the Manager for the compensation of its Chief Executive Officer, its Chief Financial Officer, its Internal Auditor, its Deputy Chairman and Executive Director (up to the third quarter of 2019) and its Chief Technical Officer (the “Executive compensation”). The current account balance with the Manager at December 31, 2019 and at December 31, 2020 was a liability of $2,084,871 and $3,701,903, respectively. The liability mainly represents payments made by the Manager on behalf of the ship-owning companies. Furthermore, the current account balance with entities that the Company owns 50.1% equity interests (Note 7) amounted to a liability of $4,958,250 and $957,958 as of December 31, 2019 and 2020, respectively. The liability mainly represents revenues collected by the Company on behalf of these entities. The Company rents office space from the Manager and incurs a rental expense (the “Rental expense”). On January 25, 2016, the Company entered into a supervision agreement with Brave for the supervision of the construction of four of its newbuilding vessels for a fixed fee of Euro 490,000 per vessel (the “Supervision fees”). On April 1, 2020, the Company entered into a new supervision agreement with Brave for the supervision of the construction of the vessel discussed in Note 5 for Supervision fees of Euro 390,000. The amounts charged by the Company’s related parties comprised the following: Year ended December 31, Location in statement of operations 2018 2019 2020 Management fees Management fees – related party 7,027,195 5,730,910 5,599,351 Brokerage commissions Voyage expenses – related party 2,037,917 1,788,543 1,799,209 Superintendent fees Vessels’ operating expenses – related party 137,000 104,000 38,000 Crew management fees Vessels’ operating expenses – related party 377,500 862,500 912,500 Commissions - vessels sold Net loss on sale of vessels 184,000 109,000 54,000 Commissions - vessels sold Impairment loss 212,650 — — Executive compensation General and administrative expenses 1,210,036 1,118,491 994,840 Rental expense General and administrative expenses 84,686 87,192 90,121 December 31, Location in balance sheet 2018 2019 2020 Commissions - vessels purchased Vessels, net 1,598,858 — 435,000 Supervision fees Vessels, net 1,790,789 — — Supervision fees Advances for vessel under construction — — 210,970 On June 5, 2020, the Company entered into memoranda of agreement with companies affiliated with members of the family of the Company’s Chief Executive Officer for the acquisition of the vessels “Eco Alice” and “Eco Texiana” for $ , respectively. The vessels were delivered to the Company on September 30, 2020 and June 19, 2020

Inventories

Inventories	12 Months Ended
Inventories	Dec. 31, 2020
Inventory Disclosure [Abstract]
Inventories	4. Inventories The amounts shown in the accompanying consolidated balance sheets are analyzed as follows: December 31, 2019 2020 Bunkers 1,112,667 2,152,601 Lubricants 1,335,036 1,534,497 Total 2,447,703 3,687,098

Advances for Vessel Under Const

Advances for Vessel Under Construction and Acquisitions	12 Months Ended
Advances for Vessel Under Construction and Acquisitions	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Advances for Vessel Under Construction and Acquisitions	5. Advances for Vessel Under Construction and Acquisitions The amounts shown in the accompanying consolidated balance sheets mainly represent advance payments to a shipbuilder for one LPG carrier under construction that the Company agreed to acquire in 2019. The vessel, which was named “Eco Blizzard”, was delivered to the Company on February 5, 2021 after the payment of the delivery installment to the shipbuilder amounting to $23,152,125. For the years ended December 31, 2019 and 2020, the movement of the account, advances for vessel under construction and acquisitions was as follows: Balance, December 31, 2018 — Advance for vessel under construction 2,891,283 Capitalized interest 97,620 Balance, December 31, 2019 2,988,903 Advance for vessel under construction 2,891,283 Capitalized interest 168,344 Supervision fees (Note 3) 210,970 Other capitalized expenses 279,615 Balance, December 31, 2020 6,539,115

Vessels, net

Vessels, net	12 Months Ended
Vessels, net	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Vessels, net	6. Vessels, net The amounts shown in the accompanying consolidated balance sheets are analyzed as follows: Vessel cost Accumulated Net Book Balance, December 31, 2018 1,105,413,815 (220,665,124 ) 884,748,691 Impairment loss (3,250,000 ) 2,256,084 (993,916 ) Disposal (14,561,832 ) 3,653,193 (10,908,639 ) Depreciation for the year — (37,693,733 ) (37,693,733 ) Balance, December 31, 2019 1,087,601,983 (252,449,580 ) 835,152,403 Additions 44,894,678 — 44,894,678 Impairment loss (14,511,735 ) 10,654,428 (3,857,307 ) Disposals (6,500,000 ) 100,378 (6,399,622 ) Depreciation for the year — (37,455,093 ) (37,455,093 ) Balance, December 31, 2020 1,111,484,926 (279,149,867 ) 832,335,059 In March 2018, the Company entered into a memorandum of agreement for the disposal of the vessel “Gas Legacy”, to an unaffiliated third party for $4,990,000. The vessel, including her inventories on board, were classified as assets held for sale in the first quarter of 2018. As a result, the Company measured the vessel at the lower of its carrying amount and fair value less the cost associated with the sale and recognized an impairment charge of $1,418,672 in its consolidated statement of operations for the year ended December 31, 2018. The vessel was delivered to her new owners on August 31, 2018. On March 31, 2018, the Company decided to seek to dispose of the vessel “Gas Enchanted”. As a result of this decision, the undiscounted net operating cash flows of this vessel did not exceed its carrying value and the Company identified and recognized an impairment charge of $1,937,822 in its consolidated statement of operations for the year ended December 31, 2018. In April 2018, the Company concluded a memorandum of agreement for the disposal of this vessel, to an unaffiliated third party for $8,950,000. The vessel was delivered to her new owners on May 7, 2018. In April 2018, the Company entered into a memorandum of agreement for the disposal of the vessel “Gas Evoluzione”, to an unaffiliated third party for $3,575,000. The vessel, including her inventories on board, were classified as assets held for sale in the second quarter of 2018. The total impairment charge recognized in the Company’s consolidated statements of operations for the year ended December 31, 2018 amounted to $604,774. The vessel was delivered to her new owners on August 28, 2018. On June 30, 2018, the Company decided to seek to dispose of the vessel “Gas Sikousis”. As a result of this decision, the undiscounted net operating cash flows of this vessel did not exceed its carrying value and the Company identified and recognized an impairment charge of $842,332 in its consolidated statement of operations for the year ended December 31, 2018. In July 2018, the Company concluded a memorandum of agreement for the disposal of this vessel, to an unaffiliated third party for $9,450,000. The vessel was delivered to her new owners on September 27, 2018. In July 2018, the Company entered into three separate memoranda of agreement for the disposal of the vessels “Gas Marathon”, “Gas Sincerity and “Gas Texiana” to unaffiliated third parties for a total of $12,700,000. The vessels, including their inventories on board, were classified as vessels held for sale in the third quarter of 2018. The total impairment charge recognized in the Company’s consolidated statements of operations for the year ended December 31, 2018 amounted to $3,358,363. The vessels were delivered to their new owners on October 13, 2018, January 28, 2019 and February 13, 2019, respectively. The Company disposed the above mentioned vessels as the agreed selling price was a suitable opportunity for the Company and realized an aggregate loss from the sale of these vessels of $763,925 which is included in the Company’s consolidated statement of operations under the caption “Net loss on sale of vessels” for the year ended December 31, 2018. During the first quarter of 2019, the Company entered into four joint venture agreements with a third party investor based on which the third party investor acquired a 49.9% equity interest in four vessel owning companies of the Company and gained co-ownership In September 2019, the Company entered into a memorandum of agreement for the disposal of the vessel “Gas Ethereal”, to an unaffiliated third party for $10,900,000. The vessel was delivered to her new owners on September 27, 2019. The Company decided to dispose the above mentioned vessels as the agreed selling price was a suitable opportunity for the Company and together with minor additional selling costs, arising from the delivery of “Gas Sincerity and “Gas Texiana” to their new owners, realized an aggregate loss from the sale of these vessels of $485,516, which is included in the Company’s consolidated statement of operations under the caption “Net loss on sale of vessels” for the year ended December 31, 2019. As of December 31, 2019, the Company performed an impairment review of its vessels, due to the prevailing conditions in the shipping industry. As a result of the impairment review, undiscounted net operating cash flows exceeded each vessel’s carrying value with the exception of two vessels and therefore the Company identified and recorded an impairment loss of $993,916 which is presented under the caption “Impairment loss” in the consolidated statements of operations. As of June 30, 2020, the Company performed an impairment review of its vessels, due to the prevailing conditions in the shipping industry. As a result of the impairment review, undiscounted net operating cash flows exceeded each vessel’s carrying value with the exception of vessels and therefore the Company identified and recorded an impairment loss of $ which is presented under the caption “Impairment loss” in the consolidated statements of operations. On September , , the Company decided to seek to dispose of the vessel “Gas Nemesis II”. As a result of this decision, the undiscounted net operating cash flows of this vessel did not exceed its carrying value and the Company identified and recognized an impairment charge of $ in its consolidated statement of operations for the year ended December , . In , the Company concluded a memorandum of agreement for the disposal of this vessel, to an unaffiliated third party for $ . The vessel was delivered to her new owners on . In , the Company concluded a memorandum of agreement for the disposal of the vessel “Gas Pasha”, to an unaffiliated third party for $ . The vessel was delivered to her new owners on . The Company disposed the above mentioned vessels as the agreed selling price was a suitable opportunity for the Company and realized an aggregate loss from the sale of these vessels of $1,134,854 which is included in the Company’s consolidated statement of operations under the caption “Net loss on sale of vessels” for the year ended December 31, 2020. As of December 31, 2020, the Company performed an impairment review of its vessels, due to the prevailing conditions in the shipping industry. As a result of the impairment review, undiscounted net operating cash flows exceeded each vessel’s carrying value with the exception of one vessel and therefore the Company identified and recorded an impairment loss of $714,895 which is presented under the caption “Impairment loss” in the consolidated statements of operations. The additions in 2020 mainly relate to the acquisition of vessels “Eco Alice” and “Eco Texiana” (Note 3) and to the installation of ballast water treatment systems. As of December 31, 2020, 36 vessels with a carrying value of $798,061,787 (2019: 34 vessels with carrying value of $787,185,762) have been provided as collateral to secure the Company’s bank loans as discussed in Note 11.

Investments in Joint Ventures

Investments in Joint Ventures	12 Months Ended
Investments in Joint Ventures	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Investments in Joint Ventures	7. Investments in joint ventures During the first quarter of 2019, the Company entered into four joint venture agreements with a third party investor based on which the third party investor acquired for $20,720,975 a 49.9% equity interest in Spacegas Inc., Financial Power Inc., Cannes View Inc. and Colorado Oil and Gas Inc., four vessel owning companies of the Company, which own the vessels “Gas Defiance”, “Gas Shuriken”, “Gas Haralambos” and “Eco Lucidity”. The remaining 50.1% equity interest was valued at $20,804,025. The Company contributed funds for working capital purposes amounting to $751,500. During the third quarter of 2019, Cannes View Inc. and Colorado Oil and Gas Inc., using the proceeds of a loan agreement that was entered into on July 9, 2019, returned an amount of $14,696,900 to the Company and the third party investor based on their equity interests. Amount returned to the Company amounted to $7,363,147. On May 22, 2019, Frost Investments Corp Inc. was incorporated under the laws of the Marshall Islands. Frost Investments Corp Inc. acquired for $20,400,000 the vessel Eco Nebula and under a joint venture agreement is owned by the Company (50.1%) and by the third party investor (49.9%). The Company contributed funds for the acquisition of vessel Eco Nebula and for working capital purposes amounting to $10,571,100, as needed and proportionate to its 50.1% equity interest. On February 13, 2020, the Company entered into a joint venture agreement with an unaffiliated third party, for the purpose of acquiring three medium gas carriers and the establishment of a new holding company. The new holding company, MGC Aggressive Holdings Inc., was established and the Company has a 51% equity interest in it. Pursuant to this joint venture agreement, subsidiaries of MGC Aggressive Holdings Inc. acquired on February 28, 2020, two mediu m gas carriers, the Gaschem Hamburg and the Gaschem Stade, and on March 11 , 2020 , one medium gas carrier, the Gaschem Bremen, at an aggregate price of $80,550,000. The Company contributed funds for the acquisition of these vessels and for working capital purposes amounting to $41,998,500, as needed and proportionate to its 51% equity interest. During the second quarter of 2020, MGC Aggressive Holdings Inc., using the proceeds of a loan agreement that was entered into on May 7, 2020, returned an amount of $47,600,000 to the Company and the unaffiliated third party based on their equity interests. Amount returned to the Company amounted to $24,276,000. During the second quarter of 2020, Frost Investments Corp Inc., using the proceeds of a loan agreement that was entered into on December 3, 2019, returned an amount of $5,000,000 to the Company and the third party investor based on their equity interests. Amount returned to the Company amounted to $2,505,000. During the first quarter of 2021, a subsidiary of MGC Aggressive Holdings Inc. entered into a memorandum of agreement for the disposal of the vessel Gaschem Hamburg to an unaffiliated third party for $34,000,000. The Company’s exposure is limited to its share of the net assets of Spacegas Inc., Financial Power Inc., Cannes View Inc., Colorado Oil and Gas Inc., Frost Investments Corp Inc. and MGC Aggressive Holdings Inc. (collectively “the joint venture entities”) proportionate to its equity interest in these companies. The Company shares the profits and losses, cash flows and other matters relating to its investments in the joint venture entities in accordance with its ownership percentage. The vessels are managed by the Manager, pursuant to management agreements, while three of the vessels were also managed by a third party manager during 2020. The Company accounts for investments in joint ventures using the equity method since it has joint control over the joint venture entities. The Company does not consolidate the joint venture entities because it does not have a controlling financial interest. The significant factors considered and judgments made in determining that the power to direct the activities of the joint venture entities that most significantly impact their economic performance are shared, are that all significant business decisions over operating and financial policies of the joint venture entities, require consent from each joint venture investor. A condensed summary of the financial information for equity accounted investments partially owned by the Company shown on a 100% basis is as follows: December 31, 2019 Spacegas Inc. Financial Power Cannes View Colorado Oil and Frost Investments Current assets 2,237,644 1,745,681 2,560,065 2,265,263 13,693,747 Non-current 13,221,364 13,229,810 14,532,274 12,801,053 20,396,424 Current liabilities 1,426,128 1,583,998 1,702,293 2,488,495 2,653,152 Long-term liabilities 5,530,995 5,530,995 7,792,274 6,818,237 10,757,210 Revenues 3,362,478 3,281,896 2,707,338 2,032,648 2,047,026 Operating income/(loss) 1,122,467 477,559 872,331 (85,071 ) (370,748 ) Net income/(loss) 854,885 212,498 627,671 (303,415 ) (420,191 ) December 31, 2020 Spacegas Financial Cannes Colorado Oil Frost MGC Current assets 2,163,484 2,359,816 1,267,542 1,126,697 10,831,800 5,096,668 Non-current 12,559,048 12,575,608 13,801,972 12,335,790 19,464,419 82,809,937 Current liabilities 1,118,776 1,491,243 1,440,769 2,688,747 2,575,067 8,315,433 Long-term liabilities 4,855,255 4,855,255 7,050,860 6,169,497 9,384,573 40,958,366 Revenues 3,222,037 3,481,799 2,764,359 2,704,455 6,866,426 18,409,814 Operating income/(loss) 451,895 935,869 (645,197 ) (817,717 ) 3,122,539 4,869,260 Net income/(loss) 246,616 728,428 (1,019,886 ) (1,155,342 ) 2,656,770 3,882,812

Accrued Liabilities

Accrued Liabilities	12 Months Ended
Accrued Liabilities	Dec. 31, 2020
Payables and Accruals [Abstract]
Accrued Liabilities	8. Accrued Liabilities The amounts shown in the accompanying consolidated balance sheets are analyzed as follows: December 31, 2019 2020 Interest on long-term debt 2,790,621 1,887,414 Administrative expenses 205,184 209,553 Vessel operating and voyage expenses 3,006,274 1,676,532 Total 6,002,079 3,773,499

Deferred Income

Deferred Income	12 Months Ended
Deferred Income	Dec. 31, 2020
Text Block [Abstract]
Deferred Income	9. Deferred Income The amounts shown in the accompanying consolidated balance sheets amounting to $2,843,994 and $2,995,657 represent cash related to time and bareboat charter revenues received in advance as of December 31, 2019 and as of December 31, 2020, respectively.

Customer Deposits

Customer Deposits	12 Months Ended
Customer Deposits	Dec. 31, 2020
Text Block [Abstract]
Customer Deposits	10. Customer Deposits These amounts represent deposits received from charterers as guarantees and are comprised as follows: (a) On October 12, 2015 an amount of $736,000 was received from the bareboat charterer of Product carrier “Clean Thrasher” (ex. “Stealth Falcon”) which is equal to three-months hire. On May 30, 2019 the amount of $368,000 was paid to the bareboat charterers. The remaining amount of $368,000 was kept as a guarantee for another vessel chartered to the same charterer. (b) On February 21, 2015 an amount of $1,820,700 was received from the bareboat charterer of Aframax tanker “Stealth Berana” (ex. “Spike”) which is equal to five-months hire. An amount of $1,220,700 was returned to the charterer at the end of the bareboat charter on March 7, 2018. The remaining amount of $600,000 was kept as a guarantee for the new bareboat charter which commenced on March 7, 2018. The bareboat charter ended during 2020 but the guarantee is still held due to a dispute (Note 19).

Long-term Debt

Long-term Debt	12 Months Ended
Long-term Debt	Dec. 31, 2020
Debt Disclosure [Abstract]
Long-term Debt	11. Long-term Debt Term Loans Drawn Amount December 31, 2019 2020 Issue Date/ Refinancing Date Maturity Date December 14, 2018 December 18, 2023 14,094,184 11,894,184 9,694,184 May 28, 2019 April 16, 2024 11,000,000 10,360,000 9,080,000 August 6, 2019 March 1, 2024 27,675,000 21,900,000 18,600,000 July 5, 2019 July 11, 2026 22,230,000 21,436,071 18,260,357 March 29, 2019 December 29, 2022 25,458,432 18,237,048 13,701,816 August 7, 2019 July 31, 2022 50,225,000 29,025,000 25,420,000 December 14, 2018 December 18, 2023 9,480,000 8,680,000 7,880,000 June 20, 2014 January 8, 2023 20,925,000 14,180,000 12,760,000 August 6, 2019 June 30, 2023 67,200,000 47,595,000 43,635,000 December 24, 2015 December 14, 2022 22,400,000 16,426,688 14,933,360 July 4, 2014 September 3, 2021 22,750,000 15,843,750 14,218,750 July 29, 2014 July 7, 2023 25,350,000 16,371,875 14,259,375 December 7, 2017 December 11, 2022 22,275,000 16,765,000 14,010,000 May 18, 2016 December 31, 2025 65,650,000 56,945,940 52,842,620 March 1, 2017 April 17, 2026 70,787,500 62,568,747 57,512,495 June 17, 2020 June 19, 2026 11,505,000 — 11,121,500 April 30, 2020 October 7, 2026 15,600,000 — 15,600,000 Total 368,229,303 353,529,457 Current portion of long-term debt 41,421,346 41,161,686 Long-term debt 326,807,957 312,367,771 Total debt 368,229,303 353,529,457 Current portion of deferred finance charges 685,790 613,794 Deferred finance charges non-current 1,560,055 1,118,450 Total deferred finance charges 2,245,845 1,732,244 Total debt 368,229,303 353,529,457 Less: Total deferred finance charges 2,245,845 1,732,244 Total debt, net of deferred finance charges 365,983,458 351,797,213 Less: Current portion of long-term debt, net of current portion of deferred finance charges 40,735,556 40,547,892 325,247,902 311,249,321 On January 11, 2021, the Company entered into a term loan with a bank to refinance the existing term loan dated August 7, 2019. The new term loan is up to $25,000,000 and will be repayable in twenty consecutive quarterly installments, with the first installment commencing three months after the drawdown. Obligations with a maturity of less than one year relating to the previous loan amounting to $14,260,000, have been presented as long-term in accordance with US GAAP as the Company refinanced these obligations on a long-term basis through the term loan that the Company entered in January 2021 discussed above. On January 19, 2021, the Company entered into a term loan with a bank to refinance the existing term loans dated July 4, 2014, June 20, 2014 and December 24, 2015. The new term loan is up to $45,000,000 and will be repayable in twenty eight consecutive quarterly installments, with the first installment commencing three months after the drawdown. Obligations with a maturity of less than one year relating to the previous loan amounting to $13,627,078, have been presented as long-term in accordance with US GAAP as the Company refinanced these obligations on a long-term basis through the term loan that the Company entered in January 2021 discussed above. The above loans are generally repayable in quarterly or semi-annual installments and a balloon payment at maturity and are secured by first priority mortgages over the vessels involved, plus the assignment of the vessels’ insurances, earnings and operating and retention accounts with the lenders, and the guarantee of ship-owning companies, as owners of the vessels. The term loans contain financial covenants requiring the Company to ensure that: • the aggregate market value of the mortgaged vessels at all times exceeds a certain percentage of the amounts outstanding as defined in the term loans, ranging from 120% to 135%, • the leverage of the Company defined as Total Debt net of Cash should not exceed 80% of total market value adjusted assets, • the Interest Coverage Ratio of the Company which is EBITDA (as defined in the loan agreements) to interest expense to be at all times greater than 2.5:1, • at least a certain percentage of the Company is to always be owned by members of the Vafias family, • the Company should maintain on a monthly basis a cash balance amounting to $1,308,971 representing a proportionate amount of the next instalment and relevant interest plus a minimum aggregate cash balance amounting to $12,015,820 in the earnings accounts with the relevant banks, • dividends paid by the borrower will not exceed 50% of the Company’s free cash flow in any rolling 12 month period. The interest rates on the outstanding loans as of December 31, 2020 are based on LIBOR plus a margin which varies from 2.15% to 3.00%. The average interest rates (including the margin) on the above outstanding loans for the applicable periods were: Year ended December 31, 2018: 5.34% Year ended December 31, 2019: 4.91% Year ended December 31, 2020: 3.58% Bank loan interest expense for the above loans for the years ended December 31, 2018, 2019 and 2020 amounted to $22,150,386, $19,999,902 and $12,116,941, respectively. Of these amounts, for the years ended December 31, 2018, 2019 and 2020, the amounts of nil, $97,620 and $168,344, respectively, were capitalized as part of advances paid for vessels under construction. Interest expense, net of interest capitalized, is included in interest and finance costs in the consolidated statements of operations. For the years ended December 31, 2018, 2019 and 2020, the amortization of deferred financing charges amounted to $858,582, $885,191 and $698,364, respectively, and is included in interest and finance costs in the consolidated statements of operations. At December 31, 2020, the Company was in compliance with all of its debt financial covenants. At December 31, 2020, an amount of $18,850,000 was available for drawdown under the above loans. The annual principal payments to be made, for the abovementioned loans, after December 31, 2020, and after taking into account the refinancing arrangements, are as follows: December 31, Amount 2021 41,161,686 2022 72,773,038 2023 65,392,513 2024 34,928,954 2025 53,314,974 Thereafter 85,958,292 Total 353,529,457

Derivatives and Fair Value Disc

Derivatives and Fair Value Disclosures	12 Months Ended
Derivatives and Fair Value Disclosures	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Derivatives and Fair Value Disclosures	12. Derivatives and Fair Value Disclosures The Company uses interest rate swaps for the management of interest rate risk exposure. The interest rate swaps effectively convert a portion of the Company’s debt from a floating to a fixed rate. The Company is a party to six floating-to-fixed The following table presents information relating to the Company’s interest rate swap arrangements as of December 31, 2019 and 2020. Effective Termination Fixed Rate Floating Rate Fair Value Asset/ Notional Fair Value Asset/ Notional Swap 1 September 30, 2015 September 30, 2020 2.60 % 3 month U.S. dollar LIBOR $ (37,567 ) $ 6,816,917 — — Swap 2 September 30, 2015 September 30, 2020 1.69 % 3 month U.S. dollar LIBOR $ 4,938 $ 6,816,917 — — Swap 3 October 2, 2015 October 2, 2020 1.54 % 3 month U.S. dollar LIBOR $ 25,443 $ 8,600,000 — — Swap 4 November 4, 2015 August 4, 2021 1.52 % 3 month U.S. dollar LIBOR $ 22,838 $ 7,921,875 $ (69,821 ) $ 7,109,375 Swap 5 December 3, 2015 September 3, 2021 1.55 % 3 month U.S. dollar LIBOR $ 16,906 $ 7,921,875 $ (71,626 ) $ 7,109,375 Swap 6 August 16, 2017 May 16, 2025 2.12 % 3 month U.S. dollar LIBOR $ (249,020 ) $ 13,711,250 $ (857,234 ) $ 12,695,750 Swap 7 March 12, 2018 December 11, 2022 2.74 % 3 month U.S. dollar LIBOR $ (419,160 ) $ 16,765,000 $ (598,572 ) $ 14,010,000 Swap 8 April 10, 2018 December 11, 2025 2.74 % 3 month U.S. dollar LIBOR $ (1,369,934 ) $ 29,524,000 $ (2,682,391 ) $ 27,452,000 Swap 9 February 16, 2019 February 16, 2024 2.89 % 3 month U.S. dollar LIBOR $ (580,136 ) $ 13,711,250 $ (961,267 ) $ 12,695,750 Total $ (2,585,692 ) $ 111,789,084 $ (5,240,911 ) $ 81,072,250 The following tables present information on the location and amounts of derivatives’ fair values reflected in the consolidated balance sheets and with respect to gains and losses on derivative positions reflected in the consolidated statements of operations or in the consolidated balance sheets, as a component of accumulated other comprehensive loss. Tabular disclosure of financial instruments is as follows: Derivatives designated as hedging instruments Balance Sheet Location December 31, 2019 2020 Asset Liability Asset Liability Interest Rate Swap Agreements Non current assets — Fair value of derivatives 39,744 — — — Interest Rate Swap Agreements Current liabilities — Fair value of derivatives — — — 141,447 Interest Rate Swap Agreements Non current liabilities — Fair value of derivatives — 2,618,250 — 5,099,464 Total derivatives designated as hedging instruments 39,744 2,618,250 — 5,240,911 Derivatives not designated as hedging instruments Balance Sheet Location December 31, 2019 2020 Asset Liability Asset Liability Interest Rate Swap Agreements Current assets — Fair value of derivatives 30,381 — — — Interest Rate Swap Agreements Current liabilities — Fair value of derivatives — 37,567 — — Total derivatives not designated as hedging instruments 30,381 37,567 — — The effect of derivative instruments on the consolidated statements of operations for the years ended December 31, 2018, 2019 and 2020 is as follows: Derivatives not designated as hedging instruments Location of Gain/(Loss) Year Ended December 31, 2018 2019 2020 Interest Rate Swap — Reclassification from OCI Loss on derivatives — 84,966 60,954 Interest Rate Swap — Change in Fair Value Loss on derivatives — (327,147 ) 7,186 Interest Rate Swap — Realized income/(expense) Loss on derivatives — 134,631 (119,116 ) Total loss on derivatives — (107,550 ) (50,976 ) Derivatives designated as hedging instruments Location of (Loss)/Gain Year Ended December 31, 2018 2019 2020 Interest Rate Swap — Loss reclassified from OCI (Effective portion) Loss on derivatives (11,982 ) — — Interest Rate Swap — Income/(Loss) reclassified from OCI (Effective portion) Interest and finance costs — 67,424 (1,190,400 ) Total loss on derivatives (11,982 ) 67,424 (1,190,400 ) The components of accumulated other comprehensive income/(loss) included in the accompanying consolidated balance sheets consist of unrealized gain / (loss) on cash flow hedges and are analyzed as follows: Unrealized Gain / Balance, January 1, 2018 617,895 Effective portion of changes in fair value of interest swap contracts 56,084 Balance, December 31, 2018 673,979 Effective portion of changes in fair value of interest swap contracts (2,848,056 ) Reclassification adjustment (84,966 ) Balance, December 31, 2019 (2,259,043 ) Effective portion of changes in fair value of interest swap contracts (2,632,826 ) Reclassification adjustment (60,954 ) Balance, December 31, 2020 (4,952,823 ) The estimated net amount of existing gains at December 31, 2020, that will be reclassified into earnings within the next twelve months relating to previously designated cash flow hedges is $60,787. Fair Value of Financial Instruments and Concentration of Credit Risk non-performance Fair Value Disclosures: Level 1: Quoted market prices in active markets for identical assets or liabilities. Level 2: Observable market based inputs or unobservable inputs that are corroborated by market data. Level 3: Unobservable inputs that are not corroborated by market data. The following table presents the fair values for assets and liabilities measured on a recurring basis categorized into a Level based upon the lowest level of significant input to the valuations as of December 31, 2019: Fair Value Fair Value Measurements Using Description Quoted Prices Significant Significant Assets/(Liabilities): Interest Rate Swap Agreements 70,125 — 70,125 — Interest Rate Swap Agreements (2,655,817 ) — (2,655,817 ) — Total (2,585,692 ) — (2,585,692 ) — The following table presents the fair values for assets and liabilities measured on a recurring basis categorized into a Level based upon the lowest level of significant input to the valuations as of December 31, 2020: Fair Value Fair Value Measurements Using Description Quoted Prices Significant Significant Assets/(Liabilities): Interest Rate Swap Agreements (5,240,911 ) — (5,240,911 ) — Total (5,240,911 ) — (5,240,911 ) — The following tables present the fair values for assets measured on a non-recurring Fair Value Fair Value Measurements Using Description Quoted Prices Significant Significant Impairment Long-lived assets held and used 6,000,000 — 6,000,000 — (993,916 ) Total 6,000,000 — 6,000,000 — (993,916) As a result of the impairment analyses performed as of December 31, 2019, two of the Company’s vessels (held and used) were written down to their estimated fair value as determined by the Company based on vessel valuations, obtained from independent third party shipbrokers, which are mainly based on recent sales and purchase transactions of similar vessels, resulting in an impairment charge of $993,916. Fair Value Fair Value Measurements Using Description Quoted Prices Significant Significant Impairment Long-lived assets held and used 3,000,000 — 3,000,000 — (305,607 ) Total 3,000,000 — 3,000,000 — (305,607) Fair Value Fair Value Measurements Using Description Quoted Prices Significant Significant Impairment Long-lived assets held and used 3,500,000 — 3,500,000 — (714,895 ) Total 3,500,000 — 3,500,000 — (714,895) As a result of the impairment analysis performed as of December 31, 2020, one of the Company’s vessels (held and used) was written down to its estimated fair value as determined by the Company based on vessel valuations, obtained from independent third party shipbrokers, which are mainly based on recent sales and purchase transactions of similar vessels, resulting in an impairment charge of $714,895.

Capital Stock, Treasury Stock a

Capital Stock, Treasury Stock and Additional Paid-in Capital	12 Months Ended
	Dec. 31, 2020
Federal Home Loan Banks [Abstract]
Capital Stock, Treasury Stock and Additional Paid-in Capital	13. Capital Stock, Treasury Stock and Additional Paid-in The amounts shown in the accompanying consolidated balance sheets as additional paid-in On May 23, 2019, the Company’s Board of Directors approved the extension of the existing stock repurchase plan for an additional amount of $10,000,000 to be used for repurchasing the Company’s common shares. For the year ended December 31, 2019, the Company completed the repurchase of 540,910 shares paying an average price per share of $3.40. For the year ended December 31, 2020, the Company completed the repurchase of 359,792 shares paying an average price per share of $2.81. These shares are held as treasury stock by the Company. For the year ended December 31, 2018, the Company did not make any repurchase of its common shares. On March 31, 2020, the Company announced the commencement of a tender offer to purchase up to 4,761,904 shares using funds available from cash and cash equivalents at a price of $2.10 per share. This tender offer expired on April 28, 2020 and 1,366,045 shares were repurchased. Shares repurchased were cancelled.

Equity Compensation Plan

Equity Compensation Plan	12 Months Ended
Equity Compensation Plan	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Equity Compensation Plan	14. Equity Compensation Plan In 2015 the Company’s shareholders and board of directors adopted an Equity Compensation Plan (“the Plan”), which replaced the Company’s previous equity compensation plan which was adopted in 2007 and expired in 2015 (the “2007 Plan”) under which the Company’s employees, directors or other persons or entities providing significant services to the Company or its subsidiaries are eligible to receive stock-based awards including restricted stock, restricted stock units, unrestricted stock, bonus stock, performance stock and stock appreciation rights. The Plan is administered by the Compensation Committee of the Company’s board of directors and the aggregate number of shares of common stock reserved under this plan cannot exceed 10% of the number of shares of Company’s common stock issued and outstanding at the time any award is granted. The Company’s Board of Directors may terminate the Plan at any time. As of December 31, 2020, a total of 555,479 restricted shares had been granted under the 2007 Plan since the first grant in the third quarter of 2007 and 264,621 awards have been granted under the Plan. On August 23, 2018, the Company granted 264,621 of non-vested non-executive All unvested restricted shares are conditional upon the option holder’s continued service as an employee of the Company, or as a director until the applicable vesting date. Until the forfeiture of any restricted shares, the grantee has the right to vote such restricted shares, to receive and retain all regular cash dividends paid on such restricted shares and to exercise all other rights provided that the Company will retain custody of all distributions other than regular cash dividends made or declared with respect to the restricted shares. The Company pays dividends on all restricted shares regardless of whether they have vested and there is no obligation of the employee to return the dividend when employment ceases. The Company did not pay any dividends in the years ended December 31, 2018, 2019 and 2020. Management has selected the accelerated method with respect to recognizing stock based compensation expense for restricted share awards with graded vesting because it considers this method to better match expense with benefits received. The stock based compensation expense for the vested and non-vested non-vested The total fair value of shares vested during the years ended December 31, 2018, 2019 and 2020 was nil, $844,141 and nil, respectively, based on the closing share price at each vesting date.

Earnings_(loss) per share

Earnings/(loss) per share	12 Months Ended
Earnings/(loss) per share	Dec. 31, 2020
Earnings Per Share [Abstract]
Earnings/(loss) per share	15. Earnings/(loss) per share Basic earnings per share is computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding during the period. Diluted earnings per share give effect to all potentially dilutive securities. All of the Company’s shares (including non-vested The Company applies the two-class non-vested non-vested two-class non-vested For purposes of calculating diluted earnings per share, dividends declared during the period for non-vested non-vested non-vested The Company calculates basic and diluted earnings per share as follows: Year Ended December 31, 2018 2019 2020 Numerator Net (loss)/income (12,276,520 ) 2,093,124 11,984,485 Less: Undistributed earnings allocated to non-vested — (8,922 ) — Net (loss)/income attributable to common shareholders, basic (12,276,520 ) 2,084,202 11,984,485 Denominator Weighted average number of shares outstanding, basic and diluted 39,860,563 39,800,434 38,357,893 (Loss)/earnings per share, basic and diluted (0.31 ) 0.05 0.31 Non-vested, The Company excluded the dilutive effect of 264,621 non-vested .

Revenues

Revenues	12 Months Ended
Revenues	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenues	16. Revenues The amounts in the accompanying consolidated statements of operations are analyzed as follows: Year ended December 31, 2018 2019 2020 Time charter revenues 104,099,818 97,249,537 101,837,425 Bareboat revenues 24,646,311 21,764,102 16,876,956 Voyage charter revenues 34,266,082 24,018,198 25,161,401 Other income 1,317,991 1,227,475 1,127,239 Total 164,330,202 144,259,312 145,003,021 The amount of revenue earned as demurrage relating to the Company’s voyage charters for the years ended December 31, 2018, 2019 and 2020 was $4.7 million, $2.0 million and $2.4 million, respectively and is included within “Voyage charter revenues” in the above table. As of December 31, 2019 and 2020, the Company recognized $118,246 and $309,608, respectively, of contract fulfillment costs which mainly represent bunker expenses incurred prior to commencement of loading relating to the Company’s voyage charters. These costs are recorded in “Other current assets” in the consolidated balance sheets. As of December 31, 2018, 2019 and 2020, revenues relating to undelivered performance obligations of the Company’s voyage charters amounted to $821,577, $439,135 and $1,353,290, respectively. The Company recognized these amounts as revenues in the first quarters of 2019, 2020 and 2021, respectively. Four of the time charters entered into in 2014, also grant the charterer an option to purchase the respective vessels during the time charter period, at stipulated prices, decreasing on a pro-rated

Vessel Operating Expenses

Vessel Operating Expenses	12 Months Ended
Vessel Operating Expenses	Dec. 31, 2020
Text Block [Abstract]
Vessel Operating Expenses	17. Vessel Operating Expenses The amounts in the accompanying consolidated statements of operations are analyzed as follows: Year ended December 31, Vessels’ Operating Expenses 2018 2019 2020 Crew wages and related costs 36,628,082 30,874,618 32,073,496 Insurance 2,068,485 2,162,523 1,889,041 Repairs and maintenance 7,359,816 5,677,033 6,590,006 Spares and consumable stores 8,907,211 7,783,902 7,990,022 Miscellaneous expenses 5,471,184 3,088,018 4,752,656 Total 60,434,778 49,586,094 53,295,221

Income Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	18. Income Taxes Under the laws of the countries of the companies’ incorporation and/or vessels’ registration, the companies are not subject to tax on international shipping income, however, they are subject to registration and tonnage taxes, which have been included in Vessel operating expenses in the consolidated statements of operations. Pursuant to the Internal Revenue Code of the United States (the “Code”), U.S. source income from the international operations of ships is generally exempt from U.S. tax if the Company operating the ships meets certain requirements. Among other things, in order to qualify for this exemption, the Company operating the ships must be incorporated in a country which grants an equivalent exemption from income taxes to U.S. corporations. All the Company’s ship-operating subsidiaries satisfy these initial criteria. In addition, these companies must be more than 50% owned by individuals who are residents, as defined, in the country of incorporation or another foreign country that grants an equivalent exemption to U.S. corporations. These companies also currently satisfy the more than 50% beneficial ownership requirement. In addition, the management of the Company believes that by virtue of a special rule applicable to situations where the ship-operating companies are beneficially owned by a publicly traded company like the Company, the more than 50% beneficial ownership requirement can also be satisfied based on the trading volume and the anticipated widely-held ownership of the Company’s shares, but no assurance can be given that this will remain so in the future, since continued compliance with this rule is subject to factors outside the Company’s control.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	19. Commitments and Contingencies • From time to time the Company expects to be subject to legal proceedings and claims in the ordinary course of its business, principally personal injury and property casualty claims. Such claims, even if lacking merit, could result in the expenditure of significant financial and managerial resources. During 2020, our Aframax tanker “Stealth Berana” was arrested in relation to claims of the charterers of the vessel for alleged losses in connection with the redelivery of the vessel to the Company. The Company commenced arbitration in accordance with the provisions of the charter party agreement in respect of all disputes arising under the charter party agreement, including the claims of the charterers. The Company in order to release the vessel promptly from arrest, provided security for the claims of the charterers by way of a payment of $1,473,000 into an escrow account. As of December 31, 2020, this amount is presented under non-current • The Company has guaranteed to the respective banks the performance of the loan agreements entered into by Spacegas Inc., Financial Power Inc. and MGC Aggressive Holdings Inc. (Note 7). The vessels owned by these entities have been provided as collateral to secure these loan agreements. Total outstanding loan balances and accrued interest of Spacegas Inc., Financial Power Inc. and MGC Aggressive Holdings Inc. as of December 31, 2020 amounted to The Company assigns a remote possibility of default to the abovementioned loan agreements and hence has not established any provisions for losses relating to this matter. With regards to the guarantee provided for the loan agreement entered into by MGC Aggressive Holdings Inc., the joint venture party • Future minimum contractual charter revenues, gross of commissions, based on vessels committed to non-cancellable, 2020 2021 2022 during 2023 and • The Company had future outstanding commitments for installment payments for vessel Eco Blizzard (Note 5) as follows: December 31 Amount 2021 23,152,125 Total 23,152,125

Leases - The Company as Lessee

Leases - The Company as Lessee	12 Months Ended
Leases - The Company as Lessee	Dec. 31, 2020
Time charterin contracts [Abstract]
Leases - The Company as Lessee	20. Leases – The Company as Lessee In November and December 2014, the Company sold the vessels Gas Premiership and Gas Cathar and realized a total gain of $780,695. The Company entered into bareboat charter agreements to leaseback the vessels for a period of four years. The charter back agreements are accounted for as operating leases and the gain on the sale was deferred and is being amortized to income over the four-year lease period. For the years ended December 31, 2018, 2019 and 2020, the amortization amounted to $190,087, nil The Company charters in vessels to supplement its own fleet and employs them both on time charters and voyage charters. The time charter-in years charter-in right-of-use right-of-use charter-in Under ASC 842, leases are classified as either finance or operating arrangements, with such classification affecting the pattern and classification of expense recognition in an entity’s income statement. For operating leases, ASC 842 requires recognition in an entity’s income statement of a single lease expense, calculated so that the cost of the lease is allocated over the lease term, generally on a straight-line basis. Right-of-use The Company used the incremental borrowing rate which amounted to 5.6% at January 1, 2019 for the lease contract for which the Company recorded operating lease right-of-use The Company had one time charter-in The Company had entered into two time charter-in Office lease In January 2019, the Company renewed its contract to lease office space from a related party (Note 3) for a period until December 2020 at an amount of EUR 6,500 ($7,345) per month. The Company determined the office lease to be an operating lease and recorded the related right-of-use-assets within operating lease right-of-use-assets and the lease liabilities within operating lease liabilities in the consolidated balance sheets as of January 1, 2019 and December 31, 2019 and the lease expense within General and administrative expenses in the consolidated statement of operations for the years ended December 31, 2018, 2019 and 2020 (Note 3). Lease Disclosures Under ASC 842 Operating lease right-of-use assets and lease liabilities as of December 31, 2019 and 2020 as follows: Description Location in balance sheet December 31, December 31, Non current assets: Chartered-in Operating lease right-of-use $ 386,388 $ — Office leases Operating lease right-of-use 86,744 — $ 473,132 $ — Liabilities: Chartered-in Current portion of operating lease liabilities $ 386,388 $ — Office leases Current portion of operating lease liabilities 86,744 — Lease liabilities - current portion $ 473,132 $ — The Operating lease right-of-use The table below presents the components of the Company’s lease expenses and sub-lease chartered-in Description Location in statement of operations 2019 2020 Lease expense for chartered-in Charter hire expenses $ 4,708,988 — Lease expense for chartered-in Charter hire expenses 1,560,000 318,606 Total charter hire expenses 6,268,988 318,606 Lease expense for office leases General and administrative expenses 87,192 90,121 Sub lease income from chartered-in Revenues 3,091,390 860,227 * The sub-lease chartered-in chartered-in chartered-in The cash paid for operating leases with terms greater than 12 months is $408,727 for the year ended December 31, 2020 (2019: $1,647,192). The Company did not enter into any operating leases greater than 12 months for the years ended December 31, 2019 and 2020 as a lessee. In addition, no operating leases in which the Company is a lessee are outstanding as of December 31, 2020. The weighted average remaining lease term on our operating leases greater than 12 months was 7.5 The table below provides the total amount of lease payments on an undiscounted basis on our time chartered-in Year Chartered-in Office leases Total Operating Discount rate upon adoption 5.6 % 5.6 % 5.6 % 2020 (undiscounted lease payments) $ 390,000 $ 88,140 $ 478,140 390,000 88,140 478,140 Present value of lease liability 386,388 86,744 473,132 Lease liabilities - short term 386,388 86,744 473,132 Total lease liabilities 386,388 86,744 473,132 Discount based on incremental borrowing rate (Difference between undiscounted lease payments and present value of lease liability) $ 3,612 $ 1,396 $ 5,008

Subsequent Events

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	21. Subsequent Events In January 2021 January 2021 January 2028 In February 2021, the second tranche of the term loan dated April 30, 2020 (Note 11) amounting to $18,850,000 was drawn down in order to partially finance the construction cost of the vessel “Eco Blizzard ” (Note 5).

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
Significant Accounting Policies (Policies)	Dec. 31, 2020
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation:
Use of Estimates	Use of Estimates:
Other Comprehensive Income	Other Comprehensive Income
Foreign Currency Translation	Foreign Currency Translation: The functional currency of the Company is the U.S. Dollar because the Company’s vessels operate in international shipping markets, which utilize the U.S. Dollar as the functional currency. The accounting books of the Company are maintained in U.S. Dollars. Transactions involving other currencies during the year are converted into U.S. Dollars using the exchange rates in effect at the time of the transactions. At the balance sheet dates, monetary assets and liabilities, which are denominated in other currencies, are translated to reflect the period end exchange rates. Resulting gains or losses are separately reflected in the accompanying consolidated statements of operations.
Cash and Cash Equivalents	Cash and Cash Equivalents:
Restricted Cash	Restricted Cash: that non-current
Trade Receivables	Trade Receivables: un-collectible
Claims Receivable	Claims Receivable:
Inventories	Inventories: Inventories consist of bunkers (for vessels under voyage charter or on ballast or idle) and lubricants which are stated at the lower of cost and net realizable value. The cost is determined by the first-in, first-out method. The Company considers victualing and stores as being consumed when purchased and, therefore, such costs are expensed when incurred.
Advances for vessels under construction	Advances This represents amounts expended by the Company in accordance with the terms of the construction contracts for vessels as well as other expenses in connection with on-site supervision. In addition, interest costs incurred during the construction (until the asset is substantially complete and ready for its intended use) are capitalized.
Vessels Acquisitions	Vessels Acquisitions: Vessels are stated at cost less depreciation and impairment, if any. Cost consists of the contract price less discounts and any material expenses incurred upon acquisition (initial repairs, improvements, acquisition and expenditures made to prepare the vessel for its initial voyage). Subsequent expenditures for conversions and major improvements are also capitalized when they appreciably extend the life, increase the earning capacity or improve the efficiency or safety of the vessels, or otherwise are charged to expenses as incurred. Where vessels are acquired with existing time charters, the Company allocates the purchase price to the vessels and to the attached time charters on the basis of their relative fair values. The capitalized above-market (assets) and below-market (liabilities) charters are amortized as a reduction and increase, respectively, to revenues over the remaining term of the charter.
Impairment or Disposal of Long-lived Assets	Impairment or Disposal of Long-lived Assets: Accounting Standards 360-10, 360-10”), for recorded as an impairment loss in the consolidated statements of operations. Various factors including anticipated future charter rates, estimated scrap values, future dry-docking costs and estimated vessel operating costs are included in this analysis. These factors are based on historical trends as well as future expectations. Undiscounted cash flows are determined by considering the revenues from existing charters for those vessels that have long term employment and when there is no charter in place the estimates based on historical average rates. An impairment loss was identified and recorded for the years ended December 31, 2018, 2019 and 2020 (Note 6).
Vessels' Depreciation	Vessels’ Depreciation: The cost of each of the Company’s vessels is depreciated on a straight-line basis over .
Assets Held for Sale	Assets Held for Sale: 360-10, No
Segment Reporting	Segment Reporting:
Accounting for Special Survey and Dry-docking Costs	Accounting for Special Survey and Dry-docking dry-docking
Deferred Finance Charges	Deferred Finance Charges: non-current
Accounting for Revenue and Related Expenses	Accounting for Revenue and Related Expenses: A time charter is a contract for the use of a vessel for a specific period of time and a specified daily charter hire rate, which is generally payable in advance. Operating costs incurred for running the vessel such as crew costs, vessel insurance, repairs and maintenance and lubricants are paid for by the Company under time charter agreements. A time charter generally provides typical warranties and owner protective restrictions. The performance obligations in a time charter are satisfied over the term of the contract beginning when the vessel is delivered to the charterer until it is redelivered back to the owner of the vessel. Some of the Company’s time charters may also contain profit sharing provisions, under which the Company can realize additional revenues in the event that spot rates are higher than the base rates in these time charters. A bareboat charter is a contract in which the vessel owner provides the vessel to the charterer for a fixed period of time at a specified daily rate, which is generally payable in advance, and the charterer generally assumes all risk and costs of operation during the bareboat charter period. The Company’s time charter and bareboat contracts are classified as operating leases pursuant to Accounting Standards Codification (“ASC”) 842 - Leases, and therefore do not fall under the scope of Accounting Standards Codification (“ASC”) 606 because (i) the vessel is an identifiable asset (ii) the owner of the vessel does not have substantive substitution rights and (iii) the charterer has the right to control the use of the vessel during the term of the contract and derives the economic benefits from such use. Time charter and bareboat revenues are recognized when a charter agreement exists, the vessel is made available to the charterer and collection of the related revenue is reasonably assured. Time charter and bareboat charter revenues are recognized as earned on a straight-line basis over the term of the charter as service is provided. Revenues from profit sharing arrangements in time charters are recognized in the period earned. Under time and bareboat charter agreements, all voyages expenses, except commissions are assumed by the charterer. On implementation of ASC 842, the Company, elected to make use of a practical expedient for lessors, not to separate the lease and non-lease non-lease non-lease A voyage charter is a contract, in which the vessel owner undertakes to transport a specific amount and type of cargo on a load port-to-discharge port basis, subject to various cargo handling terms. The Company accounts for a voyage charter when all the following criteria are met: (1) the parties to the contract have approved the contract in the form of a written charter agreement and are committed to perform their respective obligations, (2) the Company can identify each party’s rights regarding the services to be transferred, (3) the Company can identify the payment terms for the services to be transferred, (4) the charter agreement has commercial substance (that is, the risk, timing, or amount of the Company’s future cash flows is expected to change as a result of the contract) and (5) it is probable that the Company will collect substantially all of the consideration to which it will be entitled in exchange for the services that will be transferred to the charterer. The Company determined that its voyage charters consist of a single performance obligation which is met evenly as the voyage progresses and begins to be satisfied once the vessel is ready to load the cargo. The voyage charter party agreement generally has a demurrage clause according to which the charterer reimburses the vessel owner for any potential delays exceeding the allowed lay-time as per the charter party clause at the ports visited which is recorded as demurrage revenue. Revenues from voyage charters are recognized on a straight line basis over the voyage duration which commences once the vessel is ready to load the cargo and terminates upon the completion of the discharge of the cargo. Demurrage revenues are recognized when the amount can be estimated and its collection is probable. In voyage charters, vessel operating and voyage expenses are paid for by the Company. The voyage charters are considered service contracts which fall under the provisions of ASC 606 because the Company retains control over the operations of the vessels such as the routes taken or the vessels’ speed. Deferred income represents cash received for undelivered performance obligations and deferred revenue resulting from straight-line revenue recognition in respect of charter agreements that provide for varying charter rates. The portion of the deferred revenue that will be earned within the next twelve months is classified as current liability and the remaining as long-term liability. Vessel voyage expenses are direct expenses to voyage revenues and primarily consist of brokerage commissions, port expenses, canal dues and bunkers. Brokerage commissions are paid to shipbrokers for their time and efforts for negotiating and arranging charter party agreements on behalf of the Company and expensed over the related charter period and all the other voyage expenses are expensed as incurred except for expenses during the ballast portion of the voyage. Any expenses incurred during the ballast portion of the voyage (period between the contract date and the date of the vessel’s arrival to the load port) such as bunker expenses, canal tolls and port expenses are deferred and are recognized on a straight-line basis, in voyage expenses, over the voyage duration as the Company satisfies the performance obligations under the contract provided these costs are (1) incurred to fulfill a contract that the Company can specifically identify, (2) able to generate or enhance resources of the company that will be used to satisfy performance of the terms of the contract, and (3) expected to be recovered from the charterer. These costs are considered ‘contract fulfillment costs’ and are included in ‘other current assets’ in the accompanying consolidated balance sheets. Vessel operating expenses comprise all expenses relating to the operation of the vessel, including crewing, repairs and maintenance, insurance, stores, lubricants and other operating expenses. Vessel operating expenses are expensed as incurred. Under a bareboat charter, the charterer assumes responsibility for all voyage and vessel operating expenses, dry-docking expenses and risk of operation.
Equity Compensation Plan	Equity Compensation Plan: Share-based compensation includes vested and non-vested shares granted to employees of the Company, to employees of the Manager and to non-employee directors, for their services as directors and is included in General and administrative expenses in the consolidated statements of operations. These shares are measured at their fair value, which is equal to the market value of the Company’s common stock on the grant date. The shares that do not contain any future service vesting conditions are considered vested shares and the total fair value of such shares is recognized in full on the grant date. The shares that contain a time-based service vesting condition are considered non-vested shares on the grant date and a total fair value of such shares is recognized over the vesting period on a straight-line basis over the requisite service period for each separate portion of the award as if the award was, in substance, multiple awards (graded vesting attribution method). The Company accounts for forfeitures as they occur (Note 14).
Earnings/(Loss) per Share	Earnings/(Loss) per Share: two-class
Derivatives	Derivatives (i) Hedge Accounting Contracts which meet the strict criteria for hedge accounting are accounted for as cash flow hedges. A cash flow hedge is a hedge of the exposure to variability in cash flows that is attributable to a particular risk associated with a recognized asset or liability, or a highly probable forecasted transaction that could affect profit or loss. The effective portion of the gain or loss on the hedging instrument is recognized directly as a component of “Accumulated other comprehensive income” in equity, while the ineffective portion, if any, is recognized immediately in current period earnings. The Company discontinues cash flow hedge accounting if the hedging instrument expires and it no longer meets the criteria for hedge accounting or designation is revoked by the Company. At that time, any cumulative gain or loss on the hedging instrument recognized in equity is kept in equity until the forecasted transaction occurs. When the forecasted transaction occurs, any cumulative gain or loss on the hedging instrument is recognized in the statement of income. If a hedged transaction is no longer expected to occur, the net cumulative gain or loss recognized in equity is transferred to net profit or loss for the year as a component of “Loss on derivatives”. (ii) Other Derivatives
Investments in joint ventures	Investments in joint ventures: and the resulting impairment is recorded in the consolidated statements of operations.
Recent Accounting Pronouncements	Recent Accounting Pronouncements : In March 2020, the Financial Accounting Standards Board issued ASU No. 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting (“ASU 2020-04”).” ASU 2020-04 provides temporary optional expedients and exceptions to the guidance in U.S. GAAP on contract modifications and hedge accounting to ease the financial reporting burdens related to the expected market transition from the London Interbank Offered Rate (LIBOR) and other interbank offered rates to alternative reference rates. In January 2021, the FASB issued Accounting Standard Update (“ASU”) 2021-01 (Topic 848), which amends and clarifies the existing accounting standard issued in March 2020 (“ASU”) 2020-04 for Reference Rate Reform. Reference rates such as LIBOR, are widely used in a broad range of financial instruments and other agreements. The ASU permits entities to elect certain optional expedients and exceptions when accounting for derivative contracts and certain hedging relationships affected by changes in the interest rates used for discounting cash flows, for computing variation margin settlements, and for calculating price alignment interest in connection with reference rate reform activities under way in global financial markets (the “discounting transition”). The ASU 2020-04 is effective for adoption at any time between March 12, 2020 and December 31, 2022, for all entities and the ASU 2021-01 is effective for all entities as of January 7, 2021 through December 31, 2022. The Company is currently evaluating the impact of this standard in its consolidated financial statements and related disclosures.

Transactions with Related Par_2

Transactions with Related Parties (Tables)	12 Months Ended
Transactions with Related Parties (Tables)	Dec. 31, 2020
Related Party Transactions [Abstract]
Summary of Charged By Our Related Parties	The amounts charged by the Company’s related parties comprised the following: Year ended December 31, Location in statement of operations 2018 2019 2020 Management fees Management fees – related party 7,027,195 5,730,910 5,599,351 Brokerage commissions Voyage expenses – related party 2,037,917 1,788,543 1,799,209 Superintendent fees Vessels’ operating expenses – related party 137,000 104,000 38,000 Crew management fees Vessels’ operating expenses – related party 377,500 862,500 912,500 Commissions - vessels sold Net loss on sale of vessels 184,000 109,000 54,000 Commissions - vessels sold Impairment loss 212,650 — — Executive compensation General and administrative expenses 1,210,036 1,118,491 994,840 Rental expense General and administrative expenses 84,686 87,192 90,121 December 31, Location in balance sheet 2018 2019 2020 Commissions - vessels purchased Vessels, net 1,598,858 — 435,000 Supervision fees Vessels, net 1,790,789 — — Supervision fees Advances for vessel under construction — — 210,970

Inventories (Tables)

Inventories (Tables)	12 Months Ended
Inventories (Tables)	Dec. 31, 2020
Inventory Disclosure [Abstract]
Schedule of Inventory, Current	The amounts shown in the accompanying consolidated balance sheets are analyzed as follows: December 31, 2019 2020 Bunkers 1,112,667 2,152,601 Lubricants 1,335,036 1,534,497 Total 2,447,703 3,687,098

Advances for Vessel Under Con_2

Advances for Vessel Under Construction and Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Summary of Advances for vessel under construction and acquisitions	For the years ended December 31, 2019 and 2020, the movement of the account, advances for vessel under construction and acquisitions was as follows: Balance, December 31, 2018 — Advance for vessel under construction 2,891,283 Capitalized interest 97,620 Balance, December 31, 2019 2,988,903 Advance for vessel under construction 2,891,283 Capitalized interest 168,344 Supervision fees (Note 3) 210,970 Other capitalized expenses 279,615 Balance, December 31, 2020 6,539,115

Vessels, net (Tables)

Vessels, net (Tables)	12 Months Ended
Vessels, net (Tables)	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Summary of Vessels, Net	The amounts shown in the accompanying consolidated balance sheets are analyzed as follows: Vessel cost Accumulated Net Book Balance, December 31, 2018 1,105,413,815 (220,665,124 ) 884,748,691 Impairment loss (3,250,000 ) 2,256,084 (993,916 ) Disposal (14,561,832 ) 3,653,193 (10,908,639 ) Depreciation for the year — (37,693,733 ) (37,693,733 ) Balance, December 31, 2019 1,087,601,983 (252,449,580 ) 835,152,403 Additions 44,894,678 — 44,894,678 Impairment loss (14,511,735 ) 10,654,428 (3,857,307 ) Disposals (6,500,000 ) 100,378 (6,399,622 ) Depreciation for the year — (37,455,093 ) (37,455,093 ) Balance, December 31, 2020 1,111,484,926 (279,149,867 ) 832,335,059

Investments in Joint Ventures (

Investments in Joint Ventures (Tables)	12 Months Ended
Investments in Joint Ventures (Tables)	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	A condensed summary of the financial information for equity accounted investments partially owned by the Company shown on a 100% basis is as follows: December 31, 2019 Spacegas Inc. Financial Power Cannes View Colorado Oil and Frost Investments Current assets 2,237,644 1,745,681 2,560,065 2,265,263 13,693,747 Non-current 13,221,364 13,229,810 14,532,274 12,801,053 20,396,424 Current liabilities 1,426,128 1,583,998 1,702,293 2,488,495 2,653,152 Long-term liabilities 5,530,995 5,530,995 7,792,274 6,818,237 10,757,210 Revenues 3,362,478 3,281,896 2,707,338 2,032,648 2,047,026 Operating income/(loss) 1,122,467 477,559 872,331 (85,071 ) (370,748 ) Net income/(loss) 854,885 212,498 627,671 (303,415 ) (420,191 ) December 31, 2020 Spacegas Financial Cannes Colorado Oil Frost MGC Current assets 2,163,484 2,359,816 1,267,542 1,126,697 10,831,800 5,096,668 Non-current 12,559,048 12,575,608 13,801,972 12,335,790 19,464,419 82,809,937 Current liabilities 1,118,776 1,491,243 1,440,769 2,688,747 2,575,067 8,315,433 Long-term liabilities 4,855,255 4,855,255 7,050,860 6,169,497 9,384,573 40,958,366 Revenues 3,222,037 3,481,799 2,764,359 2,704,455 6,866,426 18,409,814 Operating income/(loss) 451,895 935,869 (645,197 ) (817,717 ) 3,122,539 4,869,260 Net income/(loss) 246,616 728,428 (1,019,886 ) (1,155,342 ) 2,656,770 3,882,812

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	12 Months Ended
Accrued Liabilities (Tables)	Dec. 31, 2020
Payables and Accruals [Abstract]
Schedule of Accrued Liabilities	The amounts shown in the accompanying consolidated balance sheets are analyzed as follows: December 31, 2019 2020 Interest on long-term debt 2,790,621 1,887,414 Administrative expenses 205,184 209,553 Vessel operating and voyage expenses 3,006,274 1,676,532 Total 6,002,079 3,773,499

Long-term Debt (Tables)

Long-term Debt (Tables)	12 Months Ended
Long-term Debt (Tables)	Dec. 31, 2020
Debt Disclosure [Abstract]
Schedule of Debt	Term Loans Drawn Amount December 31, 2019 2020 Issue Date/ Refinancing Date Maturity Date December 14, 2018 December 18, 2023 14,094,184 11,894,184 9,694,184 May 28, 2019 April 16, 2024 11,000,000 10,360,000 9,080,000 August 6, 2019 March 1, 2024 27,675,000 21,900,000 18,600,000 July 5, 2019 July 11, 2026 22,230,000 21,436,071 18,260,357 March 29, 2019 December 29, 2022 25,458,432 18,237,048 13,701,816 August 7, 2019 July 31, 2022 50,225,000 29,025,000 25,420,000 December 14, 2018 December 18, 2023 9,480,000 8,680,000 7,880,000 June 20, 2014 January 8, 2023 20,925,000 14,180,000 12,760,000 August 6, 2019 June 30, 2023 67,200,000 47,595,000 43,635,000 December 24, 2015 December 14, 2022 22,400,000 16,426,688 14,933,360 July 4, 2014 September 3, 2021 22,750,000 15,843,750 14,218,750 July 29, 2014 July 7, 2023 25,350,000 16,371,875 14,259,375 December 7, 2017 December 11, 2022 22,275,000 16,765,000 14,010,000 May 18, 2016 December 31, 2025 65,650,000 56,945,940 52,842,620 March 1, 2017 April 17, 2026 70,787,500 62,568,747 57,512,495 June 17, 2020 June 19, 2026 11,505,000 — 11,121,500 April 30, 2020 October 7, 2026 15,600,000 — 15,600,000 Total 368,229,303 353,529,457 Current portion of long-term debt 41,421,346 41,161,686 Long-term debt 326,807,957 312,367,771 Total debt 368,229,303 353,529,457 Current portion of deferred finance charges 685,790 613,794 Deferred finance charges non-current 1,560,055 1,118,450 Total deferred finance charges 2,245,845 1,732,244 Total debt 368,229,303 353,529,457 Less: Total deferred finance charges 2,245,845 1,732,244 Total debt, net of deferred finance charges 365,983,458 351,797,213 Less: Current portion of long-term debt, net of current portion of deferred finance charges 40,735,556 40,547,892 325,247,902 311,249,321
Schedule of Maturities of Long-term Debt	The annual principal payments to be made, for the abovementioned loans, after December 31, 2020, and after taking into account the refinancing arrangements, are as follows: December 31, Amount 2021 41,161,686 2022 72,773,038 2023 65,392,513 2024 34,928,954 2025 53,314,974 Thereafter 85,958,292 Total 353,529,457

Derivatives and Fair Value Di_2

Derivatives and Fair Value Disclosures (Tables)	12 Months Ended
Derivatives and Fair Value Disclosures (Tables)	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Schedule of Derivative Instruments	The following table presents information relating to the Company’s interest rate swap arrangements as of December 31, 2019 and 2020. Effective Termination Fixed Rate Floating Rate Fair Value Asset/ Notional Fair Value Asset/ Notional Swap 1 September 30, 2015 September 30, 2020 2.60 % 3 month U.S. dollar LIBOR $ (37,567 ) $ 6,816,917 — — Swap 2 September 30, 2015 September 30, 2020 1.69 % 3 month U.S. dollar LIBOR $ 4,938 $ 6,816,917 — — Swap 3 October 2, 2015 October 2, 2020 1.54 % 3 month U.S. dollar LIBOR $ 25,443 $ 8,600,000 — — Swap 4 November 4, 2015 August 4, 2021 1.52 % 3 month U.S. dollar LIBOR $ 22,838 $ 7,921,875 $ (69,821 ) $ 7,109,375 Swap 5 December 3, 2015 September 3, 2021 1.55 % 3 month U.S. dollar LIBOR $ 16,906 $ 7,921,875 $ (71,626 ) $ 7,109,375 Swap 6 August 16, 2017 May 16, 2025 2.12 % 3 month U.S. dollar LIBOR $ (249,020 ) $ 13,711,250 $ (857,234 ) $ 12,695,750 Swap 7 March 12, 2018 December 11, 2022 2.74 % 3 month U.S. dollar LIBOR $ (419,160 ) $ 16,765,000 $ (598,572 ) $ 14,010,000 Swap 8 April 10, 2018 December 11, 2025 2.74 % 3 month U.S. dollar LIBOR $ (1,369,934 ) $ 29,524,000 $ (2,682,391 ) $ 27,452,000 Swap 9 February 16, 2019 February 16, 2024 2.89 % 3 month U.S. dollar LIBOR $ (580,136 ) $ 13,711,250 $ (961,267 ) $ 12,695,750 Total $ (2,585,692 ) $ 111,789,084 $ (5,240,911 ) $ 81,072,250
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	Tabular disclosure of financial instruments is as follows: Derivatives designated as hedging instruments Balance Sheet Location December 31, 2019 2020 Asset Liability Asset Liability Interest Rate Swap Agreements Non current assets — Fair value of derivatives 39,744 — — — Interest Rate Swap Agreements Current liabilities — Fair value of derivatives — — — 141,447 Interest Rate Swap Agreements Non current liabilities — Fair value of derivatives — 2,618,250 — 5,099,464 Total derivatives designated as hedging instruments 39,744 2,618,250 — 5,240,911 Derivatives not designated as hedging instruments Balance Sheet Location December 31, 2019 2020 Asset Liability Asset Liability Interest Rate Swap Agreements Current assets — Fair value of derivatives 30,381 — — — Interest Rate Swap Agreements Current liabilities — Fair value of derivatives — 37,567 — — Total derivatives not designated as hedging instruments 30,381 37,567 — —
Schedule of Derivative Instruments, Gain (Loss)	The effect of derivative instruments on the consolidated statements of operations for the years ended December 31, 2018, 2019 and 2020 is as follows: Derivatives not designated as hedging instruments Location of Gain/(Loss) Year Ended December 31, 2018 2019 2020 Interest Rate Swap — Reclassification from OCI Loss on derivatives — 84,966 60,954 Interest Rate Swap — Change in Fair Value Loss on derivatives — (327,147 ) 7,186 Interest Rate Swap — Realized income/(expense) Loss on derivatives — 134,631 (119,116 ) Total loss on derivatives — (107,550 ) (50,976 ) Derivatives designated as hedging instruments Location of (Loss)/Gain Year Ended December 31, 2018 2019 2020 Interest Rate Swap — Loss reclassified from OCI (Effective portion) Loss on derivatives (11,982 ) — — Interest Rate Swap — Income/(Loss) reclassified from OCI (Effective portion) Interest and finance costs — 67,424 (1,190,400 ) Total loss on derivatives (11,982 ) 67,424 (1,190,400 )
Schedule of Accumulated Other Comprehensive Income (Loss)	The components of accumulated other comprehensive income/(loss) included in the accompanying consolidated balance sheets consist of unrealized gain / (loss) on cash flow hedges and are analyzed as follows: Unrealized Gain / Balance, January 1, 2018 617,895 Effective portion of changes in fair value of interest swap contracts 56,084 Balance, December 31, 2018 673,979 Effective portion of changes in fair value of interest swap contracts (2,848,056 ) Reclassification adjustment (84,966 ) Balance, December 31, 2019 (2,259,043 ) Effective portion of changes in fair value of interest swap contracts (2,632,826 ) Reclassification adjustment (60,954 ) Balance, December 31, 2020 (4,952,823 )
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table presents the fair values for assets and liabilities measured on a recurring basis categorized into a Level based upon the lowest level of significant input to the valuations as of December 31, 2019: Fair Value Fair Value Measurements Using Description Quoted Prices Significant Significant Assets/(Liabilities): Interest Rate Swap Agreements 70,125 — 70,125 — Interest Rate Swap Agreements (2,655,817 ) — (2,655,817 ) — Total (2,585,692 ) — (2,585,692 ) — The following table presents the fair values for assets and liabilities measured on a recurring basis categorized into a Level based upon the lowest level of significant input to the valuations as of December 31, 2020: Fair Value Fair Value Measurements Using Description Quoted Prices Significant Significant Assets/(Liabilities): Interest Rate Swap Agreements (5,240,911 ) — (5,240,911 ) — Total (5,240,911 ) — (5,240,911 ) —
Schedule of Fair Value, Assets and Liabilities Measured on Non-Recurring Basis	The following tables present the fair values for assets measured on a non-recurring Fair Value Fair Value Measurements Using Description Quoted Prices Significant Significant Impairment Long-lived assets held and used 6,000,000 — 6,000,000 — (993,916 ) Total 6,000,000 — 6,000,000 — (993,916) Fair Value Fair Value Measurements Using Description Quoted Prices Significant Significant Impairment Long-lived assets held and used 3,000,000 — 3,000,000 — (305,607 ) Total 3,000,000 — 3,000,000 — (305,607) Fair Value Fair Value Measurements Using Description Quoted Prices Significant Significant Impairment Long-lived assets held and used 3,500,000 — 3,500,000 — (714,895 ) Total 3,500,000 — 3,500,000 — (714,895)

Earnings_(loss) per share (Tabl

Earnings/(loss) per share (Tables)	12 Months Ended
Earnings/(loss) per share (Tables)	Dec. 31, 2020
Earnings Per Share [Abstract]
Basic and Diluted Earnings Per Share Calculation	The Company calculates basic and diluted earnings per share as follows: Year Ended December 31, 2018 2019 2020 Numerator Net (loss)/income (12,276,520 ) 2,093,124 11,984,485 Less: Undistributed earnings allocated to non-vested — (8,922 ) — Net (loss)/income attributable to common shareholders, basic (12,276,520 ) 2,084,202 11,984,485 Denominator Weighted average number of shares outstanding, basic and diluted 39,860,563 39,800,434 38,357,893 (Loss)/earnings per share, basic and diluted (0.31 ) 0.05 0.31

Revenues (Tables)

Revenues (Tables)	12 Months Ended
Revenues (Tables)	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Summary of Analysis of Consolidated Statements of Operations	The amounts in the accompanying consolidated statements of operations are analyzed as follows: Year ended December 31, 2018 2019 2020 Time charter revenues 104,099,818 97,249,537 101,837,425 Bareboat revenues 24,646,311 21,764,102 16,876,956 Voyage charter revenues 34,266,082 24,018,198 25,161,401 Other income 1,317,991 1,227,475 1,127,239 Total 164,330,202 144,259,312 145,003,021

Vessel Operating Expenses (Tabl

Vessel Operating Expenses (Tables)	12 Months Ended
Vessel Operating Expenses (Tables)	Dec. 31, 2020
Text Block [Abstract]
Vessel Operating Expenses	The amounts in the accompanying consolidated statements of operations are analyzed as follows: Year ended December 31, Vessels’ Operating Expenses 2018 2019 2020 Crew wages and related costs 36,628,082 30,874,618 32,073,496 Insurance 2,068,485 2,162,523 1,889,041 Repairs and maintenance 7,359,816 5,677,033 6,590,006 Spares and consumable stores 8,907,211 7,783,902 7,990,022 Miscellaneous expenses 5,471,184 3,088,018 4,752,656 Total 60,434,778 49,586,094 53,295,221

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
Commitments and Contingencies (Tables)	Dec. 31, 2020
Commitments And Contingencies Disclosures [Abstract]
Summary of future outstanding commitments	• The Company had future outstanding commitments for installment payments for vessel Eco Blizzard (Note 5) as follows: December 31 Amount 2021 23,152,125 Total 23,152,125

Leases - The Company as Lessee

Leases - The Company as Lessee (Tables)	12 Months Ended
Leases - The Company as Lessee (Tables)	Dec. 31, 2020
Time charterin contracts [Abstract]
Schedule of operating leases	Operating lease right-of-use assets and lease liabilities as of December 31, 2019 and 2020 as follows: Description Location in balance sheet December 31, December 31, Non current assets: Chartered-in Operating lease right-of-use $ 386,388 $ — Office leases Operating lease right-of-use 86,744 — $ 473,132 $ — Liabilities: Chartered-in Current portion of operating lease liabilities $ 386,388 $ — Office leases Current portion of operating lease liabilities 86,744 — Lease liabilities - current portion $ 473,132 $ —
Schedule of company's lease expenses and sub-lease income	The table below presents the components of the Company’s lease expenses and sub-lease chartered-in Description Location in statement of operations 2019 2020 Lease expense for chartered-in Charter hire expenses $ 4,708,988 — Lease expense for chartered-in Charter hire expenses 1,560,000 318,606 Total charter hire expenses 6,268,988 318,606 Lease expense for office leases General and administrative expenses 87,192 90,121 Sub lease income from chartered-in Revenues 3,091,390 860,227
Schedule of total amount of lease payments on an undiscounted basis	The table below provides the total amount of lease payments on an undiscounted basis on our time chartered-in Year Chartered-in Office leases Total Operating Discount rate upon adoption 5.6 % 5.6 % 5.6 % 2020 (undiscounted lease payments) $ 390,000 $ 88,140 $ 478,140 390,000 88,140 478,140 Present value of lease liability 386,388 86,744 473,132 Lease liabilities - short term 386,388 86,744 473,132 Total lease liabilities 386,388 86,744 473,132 Discount based on incremental borrowing rate (Difference between undiscounted lease payments and present value of lease liability) $ 3,612 $ 1,396 $ 5,008

Significant Accounting Polici_3

Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020USD ($)Segment	Dec. 31, 2019USD ($)
Significant Accounting Policies [Line Items]
Allowance for doubtful accounts receivable \| $	$ 0	$ 0
Disposal group, including discontinued operation \| $	$ 0	$ 0
Number of reportable segments \| Segment	1
Number of operating segments \| Segment	1
LPG [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	30 years
Product carriers [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	25 years

Transactions With Related Par_3

Transactions With Related Parties - Additional Information (Detail)	Jun. 05, 2020USD ($)	Apr. 01, 2020EUR (€)	Jan. 25, 2016EUR (€)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Feb. 13, 2020
Related Party Transaction [Line Items]
Management fee, per day, per vessel				$ 280
Due to related parties, current, total				$ 4,659,861	$ 7,043,121
Equity Method Investment Ownership Percentage				50.10%	50.10%		51.00%
Proceeds From Unconsolidated Joint Ventures And Subsidiaries Classified As Financing Activities				$ 1,841,380	$ 4,958,250
Eco Alice [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	$ 24,000,000
Eco Texiana [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	$ 19,500,000
The Manager [Member]
Related Party Transaction [Line Items]
Management fee, per day, per vessel				440
Management fee, per day, per vessel, under bareboat charter				$ 125
Crew management fee, per month, per vessel						$ 2,500
Sales and purchase broker commission fee, percentage				1.00%
Due to related parties, current, total				$ 3,701,903	2,084,871
Proceeds From Unconsolidated Joint Ventures And Subsidiaries Classified As Financing Activities				957,958	$ 4,958,250
The Manager [Member] \| Additional Charge Per Day When Visits Exceed Five Days In Twelve Month Period [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party				$ 500
Brave [Member] \| Vessel Construction Fee Per Vessel [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party \| €			€ 490,000
Brave [Member] \| Capitalized Construction Supervision Fees [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party \| €		€ 390,000

Transactions with Related Par_4

Transactions with Related Parties - Summary of charged by our related parties (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Commissions [Member]
Related Party Transaction [Line Items]
Due from Related Parties	$ 435,000		$ 1,598,858
Supervision Fees [Member]
Related Party Transaction [Line Items]
Due from Related Parties	0		1,790,789
Advances For Vessel Under Construction [Member]
Related Party Transaction [Line Items]
Due from Related Parties	210,970
Management Fees [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	5,599,351	$ 5,730,910	7,027,195
Brokerage Commissions [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	1,799,209	1,788,543	2,037,917
Superintendent Fees [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	38,000	104,000	137,000
Crew Management Fees [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	912,500	862,500	377,500
Net Loss On Sale Of Vessels [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	54,000	109,000	184,000
Impairment Loss [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction			212,650
Executive Compensation [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	994,840	1,118,491	1,210,036
Rental Expense [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 90,121	$ 87,192	$ 84,686

Inventories - Schedule of Inven

Inventories - Schedule of Inventory, Current (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Bunkers	$ 2,152,601	$ 1,112,667
Lubricants	1,534,497	1,335,036
Total	$ 3,687,098	$ 2,447,703

Advances for Vessel Under Con_3

Advances for Vessel Under Construction and Acquisitions - Additional Information (Detail) - USD ($)	Feb. 05, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments in and Advances to Affiliates [Line Items]
Advances for vessel under construction and acquisitions		$ 6,539,115	$ 2,988,903	$ 0
Eco Blizzard [Member] \| Subsequent Event [Member]
Investments in and Advances to Affiliates [Line Items]
Advances for vessel under construction and acquisitions	$ 23,152,125

Advances for Vessel Under Con_4

Advances for Vessel Under Construction and Acquisitions - Summary of Advances for Vessels Under Construction and Acquisitions (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Beginning balance	$ 2,988,903	$ 0
Advance for vessel under construction	2,891,283	2,891,283
Capitalized interest	168,344	97,620
Supervision fees	210,970
Other Capitalized Expenses	279,615
Ending balance	$ 6,539,115	$ 2,988,903

Vessels, Net - Summary of Vesse

Vessels, Net - Summary of Vessels, Net (Detail) - USD ($)	6 Months Ended	12 Months Ended
Vessels, Net - Summary of Vessels, Net (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Vessel cost, Balance		$ 1,087,601,983	$ 1,105,413,815
Vessel cost, Additions		44,894,678
Vessel cost, Impairment loss		(14,511,735)	(3,250,000)
Vessel cost, Disposals		(6,500,000)	(14,561,832)
Vessel cost, Balance	$ 1,111,484,926	1,111,484,926	1,087,601,983	$ 1,105,413,815
Accumulated Depreciation, Balance		(252,449,580)	(220,665,124)
Accumulated Depreciation, Impairment loss		10,654,428	2,256,084
Accumulated Depreciation, Disposals		(100,378)	(3,653,193)
Accumulated Depreciation, Depreciation for the year		(37,455,093)	(37,693,733)
Accumulated Depreciation, Balance	(279,149,867)	(279,149,867)	(252,449,580)	(220,665,124)
Net Book Value, Balance		835,152,403	884,748,691
Net Book Value, Additions		44,894,678
Net Book Value, Impairment loss		(3,857,307)	(993,916)	(11,351,821)
Net Book Value, Disposals		(6,399,622)	(10,908,639)
Net Book Value, Depreciation for the year	(170,884)	(37,455,093)	(37,693,733)	(41,258,142)
Net Book Value, Balance	$ 832,335,059	$ 832,335,059	$ 835,152,403	$ 884,748,691

Vessels, Net - Additional Infor

Vessels, Net - Additional Information (Detail)	Nov. 30, 2020USD ($)	Oct. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2019AgreementVessel	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Sep. 30, 2019USD ($)	Jul. 31, 2018USD ($)	Apr. 30, 2018USD ($)	Mar. 31, 2018USD ($)
Property, Plant and Equipment [Line Items]
Net (gain)/loss on sale of vessels					$ 1,134,854	$ 485,516	$ 763,925
impairment charge			$ 305,607		714,895
34 Vessels [Member]
Property, Plant and Equipment [Line Items]
Debt instrument, collateral amount						787,185,762
36 Vessels [Member]
Property, Plant and Equipment [Line Items]
Debt instrument, collateral amount					798,061,787
Impairment Loss [Member]
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets held-for-use			$ 653,079		714,895	993,916
Net Loss On Sale Of Vessels [Member]
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Assets	$ 1,134,854
Gas Enchanted [Member]
Property, Plant and Equipment [Line Items]
Disposal group, including discontinued operation, consideration										$ 8,950,000
Impairment of long-lived assets held-for-use							1,937,822
Gas Legacy [Member]
Property, Plant and Equipment [Line Items]
Disposal group, including discontinued operation, consideration											$ 4,990,000
Impairment of long-lived assets held-for-use							1,418,672
Gas Evoluzione [Member]
Property, Plant and Equipment [Line Items]
Disposal group, including discontinued operation, consideration										$ 3,575,000
Impairment of long-lived assets held-for-use							604,774
Gas Sikousis [Member]
Property, Plant and Equipment [Line Items]
Disposal group, including discontinued operation, consideration									$ 9,450,000
Impairment of long-lived assets held-for-use							842,332
Gas Marathon, Gas Sincerity and Gas Texiana [Member]
Property, Plant and Equipment [Line Items]
Disposal group, including discontinued operation, consideration									$ 12,700,000
Impairment of long-lived assets held-for-use							3,358,363
Gas Defiance, Gas Shuriken, Gas Haralambos and Eco Lucidity [Member]
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets held-for-use							$ 3,189,858
Number of joint venture agreements \| Agreement				4
Interest acquired on joint venture agreements				49.90%
Number of vessel owning companies \| Vessel				4
Gas Ethereal [Member]
Property, Plant and Equipment [Line Items]
Disposal group, including discontinued operation, consideration								$ 10,900,000
Gas Sincerity Gas Texiana [Member]
Property, Plant and Equipment [Line Items]
Net (gain)/loss on sale of vessels						$ 485,516
Gas Nemesis II [Member]
Property, Plant and Equipment [Line Items]
impairment charge					$ 2,489,333
Due From unaffiliated third Parties		$ 4,500,000
Vessel Delivery Date		Nov. 2, 2020
Gas Pasha [Member]
Property, Plant and Equipment [Line Items]
Due From unaffiliated third Parties	$ 900,000
Vessel Delivery Date	Dec. 7, 2020

Investments in Joint Ventures -

Investments in Joint Ventures - Additional Information (Detail)	May 07, 2020USD ($)	Feb. 13, 2020USD ($)	Dec. 03, 2019USD ($)	Jul. 09, 2019USD ($)	Mar. 31, 2021USD ($)	Dec. 31, 2019USD ($)Vessel	Dec. 31, 2020USD ($)	May 22, 2019USD ($)
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage		51.00%				50.10%	50.10%
Equity Method Investments						$ 25,250,173	$ 43,177,657
Funds contributed for working capital purposes		$ 41,998,500				$ 10,571,100
Proceeds From Equity Method Investee	$ 24,276,000		$ 2,505,000	$ 7,363,147
Equity Method Investment, Aggregate Cost		$ 80,550,000
Frost Investments Corp Inc [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage						50.10%		49.90%
Equity Method Investments								$ 20,400,000
Proceeds From Equity Method Investee			$ 5,000,000
MGC Aggressive Holdings Inc [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage							49.00%
Proceeds From Equity Method Investee	$ 47,600,000
MGC Aggressive Holdings Inc [Member] \| Gaschem Hamburg [Member] \| Subsequent Event [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from Sale of Productive Assets					$ 34,000,000
Corporate Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds From Equity Method Investee				$ 14,696,900
Co-venturer [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage						49.90%
Equity Method Investment minority interest						$ 20,720,975
Number of joint ventures \| Vessel						4
Equity Method Investments						$ 20,804,025
Co-venturer [Member] \| Frost Investments Corp Inc [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage								50.10%
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Funds contributed for working capital purposes						$ 751,500

Investments in Joint Ventures_2

Investments in Joint Ventures - Summary of the Financial Information for Equity Accounted Investments (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Current assets	$ 48,053,524	$ 77,932,439
Non-current assets	895,952,783	876,256,492
Current liabilities	63,061,107	67,136,139
Long-term liabilities	316,348,785	327,866,152
Revenues	145,003,021	144,259,312	$ 164,330,202
Operating income/(loss)	23,341,950	21,709,008	10,541,651
Net income/(loss)	11,984,485	2,093,124	$ (12,276,520)
Space Gas Inc [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	2,163,484	2,237,644
Non-current assets	12,559,048	13,221,364
Current liabilities	1,118,776	1,426,128
Long-term liabilities	4,855,255	5,530,995
Revenues	3,222,037	3,362,478
Operating income/(loss)	451,895	1,122,467
Net income/(loss)	246,616	854,885
Financial Power Inc [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	2,359,816	1,745,681
Non-current assets	12,575,608	13,229,810
Current liabilities	1,491,243	1,583,998
Long-term liabilities	4,855,255	5,530,995
Revenues	3,481,799	3,281,896
Operating income/(loss)	935,869	477,559
Net income/(loss)	728,428	212,498
Cannes View Inc [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	1,267,542	2,560,065
Non-current assets	13,801,972	14,532,274
Current liabilities	1,440,769	1,702,293
Long-term liabilities	7,050,860	7,792,274
Revenues	2,764,359	2,707,338
Operating income/(loss)	(645,197)	872,331
Net income/(loss)	(1,019,886)	627,671
ColoradoOiland Gas Inc [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	1,126,697	2,265,263
Non-current assets	12,335,790	12,801,053
Current liabilities	2,688,747	2,488,495
Long-term liabilities	6,169,497	6,818,237
Revenues	2,704,455	2,032,648
Operating income/(loss)	(817,717)	(85,071)
Net income/(loss)	(1,155,342)	(303,415)
Frost Investments Corp Inc [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	10,831,800	13,693,747
Non-current assets	19,464,419	20,396,424
Current liabilities	2,575,067	2,653,152
Long-term liabilities	9,384,573	10,757,210
Revenues	6,866,426	2,047,026
Operating income/(loss)	3,122,539	(370,748)
Net income/(loss)	2,656,770	$ (420,191)
MGC Aggressive Holdings Inc [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	5,096,668
Non-current assets	82,809,937
Current liabilities	8,315,433
Long-term liabilities	40,958,366
Revenues	18,409,814
Operating income/(loss)	4,869,260
Net income/(loss)	$ 3,882,812

Accrued Liabilities - Schedule

Accrued Liabilities - Schedule of Accrued Liabilities (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Accrued Liabilities [Abstract]
Interest on long-term debt	$ 1,887,414	$ 2,790,621
Administrative expenses	209,553	205,184
Vessel operating and voyage expenses	1,676,532	3,006,274
Total	$ 3,773,499	$ 6,002,079

Deferred Income - Additional In

Deferred Income - Additional Information (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Deferred Revenue Arrangement [Line Items]
Deferred revenue, current	$ 2,995,657	$ 2,843,994
Time and Bareboat Deferred Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue, current	$ 2,995,657	$ 2,843,994

Customer Deposits - Additional

Customer Deposits - Additional Information (Detail) - USD ($)	May 30, 2019	Mar. 07, 2018	Oct. 12, 2015	Feb. 21, 2015	Dec. 31, 2020
Spike [Member]
Deposits [Line Items]
Proceeds from deposits from customers				$ 1,820,700
Repayment of deposits from customers		$ 1,220,700
Deposits from customers kept as guarantee					$ 600,000
Navig8 Faith [Member]
Deposits [Line Items]
Proceeds from deposits from customers			$ 736,000
Repayment of deposits from customers	$ 368,000
Deposits from customers kept as guarantee	$ 368,000

Long-term Debt - Schedule of De

Long-term Debt - Schedule of Debt (Detail) - USD ($)	12 Months Ended
Long-term Debt - Schedule of Debt (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Aug. 07, 2019
Debt Instrument [Line Items]
Drawn Amount			$ 45,000,000
Term Loans	$ 353,529,457	$ 368,229,303
Current portion of long-term debt	41,161,686	41,421,346
Long term debt	312,367,771	326,807,957
Total debt	353,529,457	368,229,303
Current portion of deferred finance charges	613,794	685,790
Deferred finance charges non-current	1,118,450	1,560,055
Total deferred finance charges	1,732,244	2,245,845
Total debt	353,529,457	368,229,303
Less: Total deferred finance charges	1,732,244	2,245,845
Total debt, net of deferred finance charges	351,797,213	365,983,458
Less: Current portion of long-term debt, net of current portion of deferred finance charges	40,547,892	40,735,556
Long term debt, net of deferred finance charges	$ 311,249,321	325,247,902
Term Loan 1 [Member]
Debt Instrument [Line Items]
Maturity Date	Dec. 18, 2023
Drawn Amount	$ 14,094,184
Term Loans	$ 9,694,184	11,894,184
Term Loan 4 [Member]
Debt Instrument [Line Items]
Maturity Date	Apr. 16, 2024
Drawn Amount	$ 11,000,000
Term Loans	$ 9,080,000	10,360,000
Term Loan 2 [Member]
Debt Instrument [Line Items]
Maturity Date	Mar. 1, 2024
Drawn Amount	$ 27,675,000
Term Loans	$ 18,600,000	21,900,000
Term Loan 20 [Member]
Debt Instrument [Line Items]
Maturity Date	Jul. 11, 2026
Drawn Amount	$ 22,230,000
Term Loans	$ 18,260,357	21,436,071
Term Loan 21 [Member]
Debt Instrument [Line Items]
Maturity Date	Dec. 29, 2022
Drawn Amount	$ 25,458,432
Term Loans	$ 13,701,816	18,237,048
Term Loan 3 [Member]
Debt Instrument [Line Items]
Maturity Date	Jul. 31, 2022
Drawn Amount	$ 50,225,000
Term Loans	$ 25,420,000	29,025,000
Term Loan 5 [Member]
Debt Instrument [Line Items]
Maturity Date	Dec. 18, 2023
Drawn Amount	$ 9,480,000
Term Loans	$ 7,880,000	8,680,000
Term Loan 6 [Member]
Debt Instrument [Line Items]
Maturity Date	Jan. 8, 2023
Drawn Amount	$ 20,925,000
Term Loans	$ 12,760,000	14,180,000
Term Loan 22 [Member]
Debt Instrument [Line Items]
Maturity Date	Jun. 30, 2023
Drawn Amount	$ 67,200,000
Term Loans	$ 43,635,000	47,595,000
Term Loan 23 [Member]
Debt Instrument [Line Items]
Maturity Date	Dec. 14, 2022
Drawn Amount	$ 22,400,000
Term Loans	$ 14,933,360	16,426,688
Term Loan 24 [Member]
Debt Instrument [Line Items]
Maturity Date	Sep. 3, 2021
Drawn Amount	$ 22,750,000
Term Loans	$ 14,218,750	15,843,750
Term Loan 10 [Member]
Debt Instrument [Line Items]
Maturity Date	Jul. 7, 2023
Drawn Amount	$ 25,350,000
Term Loans	$ 14,259,375	16,371,875
Term Loan 7 [Member]
Debt Instrument [Line Items]
Maturity Date	Dec. 11, 2022
Drawn Amount	$ 22,275,000
Term Loans	$ 14,010,000	16,765,000
Term Loan 8 [Member]
Debt Instrument [Line Items]
Maturity Date	Dec. 31, 2025
Drawn Amount	$ 65,650,000
Term Loans	$ 52,842,620	56,945,940
Term Loan 9 [Member]
Debt Instrument [Line Items]
Maturity Date	Apr. 17, 2026
Drawn Amount	$ 70,787,500
Term Loans	$ 57,512,495	62,568,747
Term Loan 11 [Member]
Debt Instrument [Line Items]
Maturity Date	Jun. 19, 2026
Drawn Amount	$ 11,505,000
Term Loans	$ 11,121,500	0
Term Loan 12 [Member]
Debt Instrument [Line Items]
Maturity Date	Oct. 7, 2026
Drawn Amount	$ 15,600,000
Term Loans	$ 15,600,000	$ 0

Long-term Debt - Additional Inf

Long-term Debt - Additional Information (Detail)	12 Months Ended
Long-term Debt - Additional Information (Detail)	Dec. 31, 2020USD ($)DerivativeInstrument	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Jan. 11, 2021USD ($)	Aug. 07, 2019USD ($)	Jul. 04, 2014USD ($)
Debt Instrument [Line Items]
Restricted cash	$ 1,308,971	$ 1,589,768	$ 3,002,490
Term loan financial covenants, cash requirement	12,015,820
Amortization of debt issuance costs	$ 698,364	$ 885,191	$ 858,582
Debt,weighted average interest rate	3.58%	4.91%	5.34%
Interest expense, debt, total	$ 12,116,941	$ 19,999,902	$ 22,150,386
Interest costs capitalized	168,344	$ 97,620	$ 0
Debt Instrument, Face Amount					$ 45,000,000
Long-term Debt, Gross					$ 14,260,000	$ 13,627,078
Debt Instrument drawn Down Amount	$ 18,850,000
Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 25,000,000
Maximum [Member]
Debt Instrument [Line Items]
Value to term loan ratio	135.00%
Percentage of total debt to total market value adjusted assets	80.00%
Percentage of dividends paid to free cash flow	50.00%
Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.00%
Minimum [Member]
Debt Instrument [Line Items]
Value to term loan ratio	120.00%
EBITDA to interest expense ratio \| DerivativeInstrument	2.5
Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.15%

Long-term Debt - Schedule of Ma

Long-term Debt - Schedule of Maturities of Long-term Debt (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Maturities of Long-term Debt [Abstract]
2021	$ 41,161,686
2022	72,773,038
2023	65,392,513
2024	34,928,954
2025	53,314,974
Thereafter	85,958,292
Total	$ 353,529,457	$ 368,229,303

Derivatives and Fair Value Di_3

Derivatives and Fair Value Disclosures - Additional Information (Detail)	Dec. 31, 2020USD ($)DerivativeInstrument	Dec. 31, 2019USD ($)DerivativeInstrument
Derivatives, Fair Value [Line Items]
Derivative, notional amount	$ 81,072,250	$ 111,789,084
Cash Flow Hedge Gain Loss To Be Reclassified During Next Twelve Months	60,787
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount	$ 81,072,250	$ 111,789,084
Number of instruments \| DerivativeInstrument	9	9

Derivatives and Fair Value Di_4

Derivatives and Fair Value Disclosures - Schedule of the Company's interest rate swap arrangements (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Fair Value Asset/(Liability)	$ (5,240,911)	$ (2,585,692)
Derivative, notional amount	$ 81,072,250	111,789,084
Swap 1
Derivatives, Fair Value [Line Items]
Effective Date	Sep. 30, 2015
Termination Date	Sep. 30, 2020
Fixed Rate (Company Pays)	2.60%
Floating Rate(Company Receives)	3 month U.S. dollar LIBOR
Fair Value Asset/(Liability)		(37,567)
Derivative, notional amount		6,816,917
Swap 2
Derivatives, Fair Value [Line Items]
Effective Date	Sep. 30, 2015
Termination Date	Sep. 30, 2020
Fixed Rate (Company Pays)	1.69%
Floating Rate(Company Receives)	3 month U.S. dollar LIBOR
Fair Value Asset/(Liability)		4,938
Derivative, notional amount		6,816,917
Swap 3
Derivatives, Fair Value [Line Items]
Effective Date	Oct. 2, 2015
Termination Date	Oct. 2, 2020
Fixed Rate (Company Pays)	1.54%
Floating Rate(Company Receives)	3 month U.S. dollar LIBOR
Fair Value Asset/(Liability)		25,443
Derivative, notional amount		8,600,000
Swap 4
Derivatives, Fair Value [Line Items]
Effective Date	Nov. 4, 2015
Termination Date	Aug. 4, 2021
Fixed Rate (Company Pays)	1.52%
Floating Rate(Company Receives)	3 month U.S. dollar LIBOR
Fair Value Asset/(Liability)	$ (69,821)	22,838
Derivative, notional amount	$ 7,109,375	7,921,875
Swap 5
Derivatives, Fair Value [Line Items]
Effective Date	Dec. 3, 2015
Termination Date	Sep. 3, 2021
Fixed Rate (Company Pays)	1.55%
Floating Rate(Company Receives)	3 month U.S. dollar LIBOR
Fair Value Asset/(Liability)	$ (71,626)	16,906
Derivative, notional amount	$ 7,109,375	7,921,875
Swap 6
Derivatives, Fair Value [Line Items]
Effective Date	Aug. 16, 2017
Termination Date	May 16, 2025
Fixed Rate (Company Pays)	2.12%
Floating Rate(Company Receives)	3 month U.S. dollar LIBOR
Fair Value Asset/(Liability)	$ (857,234)	(249,020)
Derivative, notional amount	$ 12,695,750	13,711,250
Swap 7
Derivatives, Fair Value [Line Items]
Effective Date	Mar. 12, 2018
Termination Date	Dec. 11, 2022
Fixed Rate (Company Pays)	2.74%
Floating Rate(Company Receives)	3 month U.S. dollar LIBOR
Fair Value Asset/(Liability)	$ (598,572)	(419,160)
Derivative, notional amount	$ 14,010,000	16,765,000
Swap 8
Derivatives, Fair Value [Line Items]
Effective Date	Apr. 10, 2018
Termination Date	Dec. 11, 2025
Fixed Rate (Company Pays)	2.74%
Floating Rate(Company Receives)	3 month U.S. dollar LIBOR
Fair Value Asset/(Liability)	$ (2,682,391)	(1,369,934)
Derivative, notional amount	$ 27,452,000	29,524,000
Swap 9
Derivatives, Fair Value [Line Items]
Effective Date	Feb. 16, 2019
Termination Date	Feb. 16, 2024
Fixed Rate (Company Pays)	2.89%
Floating Rate(Company Receives)	3 month U.S. dollar LIBOR
Fair Value Asset/(Liability)	$ (961,267)	(580,136)
Derivative, notional amount	$ 12,695,750	$ 13,711,250

Derivatives and Fair Value Di_5

Derivatives and Fair Value Disclosures - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative assets non-current		$ 39,744
Derivative liabilities non-current	$ 5,099,464	2,618,250
Derivative assets current		30,381
Derivative liabilities current	141,447	37,567
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		39,744
Derivative liabilities	5,240,911	2,618,250
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative assets non-current		39,744
Derivative liabilities non-current	5,099,464	2,618,250
Derivative liabilities current	$ 141,447
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		30,381
Derivative liabilities		37,567
Not Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative assets current		30,381
Derivative liabilities current		$ 37,567

Derivatives and Fair Value Di_6

Derivatives and Fair Value Disclosures - Schedule of Derivative Instruments, Gain (Loss) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on derivatives	$ (50,976)	$ (107,550)
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on derivatives	(1,190,400)	67,424	$ (11,982)
Interest Rate Swap [Member] \| Loss On Derivatives [Member] \| Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Swap — Income (loss) Reclassification from OCI	60,954	84,966
Interest Rate Swap — Change in Fair Value	7,186	(327,147)
Interest Rate Swap — Realized income	(119,116)	134,631
Interest Rate Swap [Member] \| Loss On Derivatives [Member] \| Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Swap — Income (loss) Reclassification from OCI			$ (11,982)
Interest Rate Swap [Member] \| Interest And Finance Costs [Member] \| Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Swap — Income (loss) Reclassification from OCI	$ (1,190,400)	$ 67,424

Derivatives and Fair Value Di_7

Derivatives and Fair Value Disclosures - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (2,259,043)
Reclassification adjustment	60,954	$ 84,966
Ending balance	(4,952,823)	(2,259,043)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2,259,043)	673,979	$ 617,895
Effective portion of changes in fair value of interest swap contracts	(2,632,826)	(2,848,056)	56,084
Reclassification adjustment	(60,954)	(84,966)
Ending balance	$ (4,952,823)	$ (2,259,043)	$ 673,979

Derivatives and Fair Value Di_8

Derivatives and Fair Value Disclosures - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fail value measurement	$ (5,240,911)	$ (2,585,692)
Interest Rate Swap 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fail value measurement	(5,240,911)	70,125
Interest Rate Swap 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fail value measurement		(2,655,817)
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fail value measurement	(5,240,911)	(2,585,692)
Fair Value, Inputs, Level 2 [Member] \| Interest Rate Swap 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fail value measurement	$ (5,240,911)	70,125
Fair Value, Inputs, Level 2 [Member] \| Interest Rate Swap 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fail value measurement		$ (2,655,817)

Derivatives and Fair Value Di_9

Derivatives and Fair Value Disclosures - Schedule of Fair Value, Assets and Liabilities Measured on Non-Recurring Basis (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total		$ (3,857,307)	$ (993,916)	$ (11,351,821)
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets held and used			6,000,000
Long-lived assets held for sale		3,500,000			$ 3,000,000
Total	$ 3,000,000	3,500,000	6,000,000
Long-lived assets held and used	(305,607)	(714,895)	(993,916)
Total	(305,607)	(714,895)	(993,916)
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets held and used			6,000,000
Long-lived assets held for sale		3,500,000			$ 3,000,000
Total	$ 3,000,000	$ 3,500,000	$ 6,000,000

Derivatives and Fair Value D_10

Derivatives and Fair Value Disclosures - Additional Information - 2 (Detail) - USD ($)	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Depreciation, total		$ 170,884	$ 37,455,093	$ 37,693,733	$ 41,258,142
Impairment of long-lived assets to be disposed of	$ 305,607		714,895
Tangible Asset Impairment Charges				993,916
Property, Plant and Equipment, Net		832,335,059	832,335,059	$ 835,152,403	$ 884,748,691
Gas Pasha And Gas Evoluzione [Member]
Derivatives, Fair Value [Line Items]
Property, Plant and Equipment, Net		$ 2,829,116	$ 2,829,116

Capital Stock, Treasury Stock_2

Capital Stock, Treasury Stock and Additional Paid-in Capital - Additional Information (Detail) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 23, 2019
Stockholders' Equity Note [Abstract]
Stock repurchased during period, share	1,366,045
Treasury stock acquired, average cost per share		$ 3.40	$ 2.81
Treasury stock, shares, acquired		540,910	359,792
Stock repurchase program, authorized amount, additional				$ 10,000,000
Stock Issued During Period, Shares, Acquisitions	4,761,904
Shares Issued, Price Per Share	$ 2.10
Stock Repurchase Program Expiration Date	Apr. 28, 2020

Equity Compensation Plan - Addi

Equity Compensation Plan - Additional Information (Detail) - USD ($)	Aug. 23, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award Options [Line Items]
Dividends, total		$ 0	$ 0	$ 0
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value		0	844,141	0
Non Vested Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award Options [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period	264,621
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value	$ 3.59
Share-based compensation arrangement by share-based payment award, award vesting period	1 year
Restricted Stock [Member] \| General and Administrative Expense [Member]
Share Based Compensation Arrangement By Share Based Payment Award Options [Line Items]
Allocated share-based compensation expense, total		$ 0	$ 611,644	$ 338,356
The Plan Member
Share Based Compensation Arrangement By Share Based Payment Award Options [Line Items]
Common stock, reserved percentage		10.00%
The Plan Member \| Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award Options [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period		264,621
2007 Plan [Member] \| Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award Options [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period		555,479

Earnings_(loss) per share - Bas

Earnings/(loss) per share - Basic and Diluted Earnings Per Share Calculation (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net (loss)/income	$ 11,984,485	$ 2,093,124	$ (12,276,520)
Less: Undistributed earnings allocated to non-vested shares	0	(8,922)	0
Net (loss)/income attributable to common shareholders, basic	$ 11,984,485	$ 2,084,202	$ (12,276,520)
Weighted average number of shares outstanding, basic and diluted	38,357,893	39,800,434	39,860,563
(Loss)/earnings per share, basic and diluted	$ 0.31	$ 0.05	$ (0.31)

Earnings_(loss) per share - Add

Earnings/(loss) per share - Additional Information (Detail)	12 Months Ended
Earnings/(loss) per share - Additional Information (Detail)	Dec. 31, 2018shares
Earnings Per Share [Abstract]
Dilutive effect excluded from computation of earnings per share	264,621

Revenues - Summary of Analysis

Revenues - Summary of Analysis of Consolidated Statements of Operations (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 145,003,021	$ 144,259,312	$ 164,330,202
Total revenues	145,003,021	144,259,312	164,330,202
Time Charter [Member]
Disaggregation of Revenue [Line Items]
Revenues	101,837,425	97,249,537	104,099,818
Bareboat [Member]
Disaggregation of Revenue [Line Items]
Revenues	16,876,956	21,764,102	24,646,311
Voyage Charter [Member]
Disaggregation of Revenue [Line Items]
Revenues	25,161,401	24,018,198	34,266,082
Other Income Revenues [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 1,127,239	$ 1,227,475	$ 1,317,991

Revenues - Additional Informati

Revenues - Additional Information (Detail) - USD ($)	12 Months Ended
Revenues - Additional Information (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 145,003,021	$ 144,259,312	$ 164,330,202
Unearned revenue	1,353,290	439,135	821,577
Voyage Charters [Member]
Disaggregation of Revenue [Line Items]
Contract fulfilment cost	309,608	118,246
Voyage Charters [Member] \| Demurrage [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 2,400,000	$ 2,000,000	$ 4,700,000

Vessel Operating Expenses - Ves

Vessel Operating Expenses - Vessel Operating Expenses (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Vessel Operating Expenses [Abstract]
Crew wages and related costs	$ 32,073,496	$ 30,874,618	$ 36,628,082
Insurance	1,889,041	2,162,523	2,068,485
Repairs and maintenance	6,590,006	5,677,033	7,359,816
Spares and consumable stores	7,990,022	7,783,902	8,907,211
Miscellaneous expenses	4,752,656	3,088,018	5,471,184
Total	$ 53,295,221	$ 49,586,094	$ 60,434,778

Commitments and Contingencies -

Commitments and Contingencies - Summary Of Future Outstanding Commitments (Detail)	Dec. 31, 2020USD ($)
Commitments And Contingencies Disclosure [Line Items]
2021	$ 23,152,125
Total	$ 23,152,125

Commitments and Contingencies_2

Commitments and Contingencies - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Feb. 13, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Line Items]
Contract receivable, due in next twelve months		$ 56,188,663
Contract receivable, due in year two		12,226,819
Contract receivable, due in year three		3,833,508
Contract receivable, due in year four		1,543,100
Contractual Obligation		23,152,125
Long-term Debt		353,529,457		$ 368,229,303
Accrued Interest		$ 194,144
Equity Method Investment, Ownership Percentage		50.10%	51.00%	50.10%
MGC Aggressive Holdings Inc [Member]
Commitments and Contingencies Disclosure [Line Items]
Long-term Debt		$ 46,875,000
Accrued Interest		$ 153,320
Equity Method Investment, Ownership Percentage		49.00%
Percentage of outstanding Loan balance		49.00%
Financial Guarantee [Member] \| Spacegas Inc., Financial Power Inc. and MGC Aggressive Holdings Inc. [Member]
Commitments and Contingencies Disclosure [Line Items]
Long-term Debt		$ 57,985,000
Time Charters [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual Obligation		$ 1,473,000
Astrid and Kazak [Member]
Commitments and Contingencies Disclosure [Line Items]
Sale leaseback transaction, rent expense	12 months	12 months

Leases - The Company as Lesse_2

Leases - The Company as Lessee - Schedule of operating leases (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Non current assets	$ 0	$ 473,132
Liabilities		473,132
Chartered-in contract greater than 12 months [Member]
Lessee, Lease, Description [Line Items]
Non current assets		386,388
Liabilities		386,388
Office leases [Member]
Lessee, Lease, Description [Line Items]
Non current assets		86,744
Liabilities		$ 86,744

Leases - The Company as Lesse_3

Leases - The Company as Lessee - Schedule of company's lease expenses and sub-lease income (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Sub lease income from chartered-in contracts greater than 12 months		$ 0
Time Charter In Contracts [Member]
Sub lease income from chartered-in contracts greater than 12 months		0	$ 482,879
Charter Hire Expenses [Member]
Lease expense for chartered-in contracts 12 months or less			4,708,988
Lease expense for chartered-in contracts greater than 12 months		318,606	1,560,000
Total charter hire expenses		318,606	6,268,988
General and Administrative Expense [Member]
Lease expense for office leases		90,121	87,192
Revenue [member]
Sub lease income from chartered-in contracts greater than 12 months	[1]	$ 860,227	$ 3,091,390

[1]	The sub-lease income represents only time charter revenue earned on the chartered-in contracts greater than 12 months. There is additional revenue of $482,879 earned from voyage charters on the same chartered-in contract which is recorded in Revenues in our consolidated statement of operations for the year ended December 31, 2019 (2020: nil). Additionally, there is revenue earned from time charters from chartered-in contracts 12 months or less which is included in Revenues in our consolidated statements of operations for the year ended December 31, 2019. No such contracts existed for the year ended December 31, 2020.

Leases - The Company as Lesse_4

Leases - The Company as Lessee - Schedule of total amount of lease payments on an undiscounted basis (Detail)	Dec. 31, 2019USD ($)
Discount rate upon adoption	5.60%
2020	$ 478,140
Lessee, Operating Lease, Liability, Payments, Due	478,140
Operating Lease, Liability	473,132
Lease liabilities - short term	473,132
Total lease liabilities	473,132
Discount based on incremental borrowing rate	$ 5,008
Chartered-in contract greater than 12 months [Member]
Discount rate upon adoption	5.60%
2020	$ 390,000
Lessee, Operating Lease, Liability, Payments, Due	390,000
Operating Lease, Liability	386,388
Lease liabilities - short term	386,388
Total lease liabilities	386,388
Discount based on incremental borrowing rate	$ 3,612
Office leases [Member]
Discount rate upon adoption	5.60%
2020	$ 88,140
Lessee, Operating Lease, Liability, Payments, Due	88,140
Operating Lease, Liability	86,744
Lease liabilities - short term	86,744
Total lease liabilities	86,744
Discount based on incremental borrowing rate	$ 1,396

Leases - The Company as Lesse_5

Leases - The Company as Lessee - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2014
Incremental borrowing rate			5.60%
Operating Lease, Payments		$ 408,727	$ 1,647,192
Operating Lease Term Of Contract		5 years
Sublease Income		$ 0
Operating Lease, Weighted Average Discount Rate, Percent			5.60%
Minimum [Member]
Lessee, Finance Lease, Remaining Lease Term		7 months 15 days
Maximum [Member]
Lessee, Finance Lease, Remaining Lease Term		12 months
Office Space [Member]
Incremental borrowing rate			5.60%
Operating lease monthly rent expense			$ 6,500	$ 7,345
Operating Lease, Weighted Average Discount Rate, Percent			5.60%
Time Charter In Contracts [Member]
Incremental borrowing rate			5.60%
Sublease Income		$ 0	$ 482,879
Operating Lease, Weighted Average Discount Rate, Percent			5.60%
Time Charter In Contracts [Member] \| Minimum [Member]
Operating Lease Term Of Contract		1 year
Time Charter In Contracts [Member] \| Maximum [Member]
Operating Lease Term Of Contract		5 years
Charter Hire Expenses [Member] \| Bareboat Charters [Member]
Current Period Gain Recognized		$ 130,000	$ 4,708,988	2,906,617
Gas Premiership And Gas Cathar [Member]
Deferred gain gross					$ 780,695
Gas Premiership And Gas Cathar [Member] \| Charter Hire Expenses [Member]
Current Period Gain Recognized		0	0	190,087
Gas Premiership And Gas Cathar [Member] \| Charter Hire Expenses [Member] \| Bareboat Charters [Member]
Operating Lease Rent Expense		$ 318,606	$ 1,560,000	$ 3,434,250
Astrid and Kazak [Member]
Sale leaseback transaction, term of lease	12 months	12 months

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2021	Dec. 31, 2020	Feb. 28, 2021	Jan. 11, 2021	Aug. 07, 2019
Subsequent Event [Line Items]
Debt Instrument drawn down amount		$ 18,850,000
Debt Instrument, Face Amount					$ 45,000,000
Term Loan 2 [Member]
Subsequent Event [Line Items]
Debt Instrument, Maturity Date		Mar. 1, 2024
Debt Instrument, Face Amount		$ 27,675,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount				$ 25,000,000
Subsequent Event [Member] \| Eco Blizzard [Member] \| Term Loan 2 [Member]
Subsequent Event [Line Items]
Debt Instrument drawn down amount			$ 18,850,000
Subsequent Event [Member] \| Three Floatingt Of Fixed Interest Swap Agreements [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.73%
Debt Instrument, Face Amount	$ 43,800,000
Subsequent Event [Member] \| Three Floatingt Of Fixed Interest Swap Agreements [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Debt Instrument, Maturity Date	Jan. 31, 2028
Subsequent Event [Member] \| Three Floatingt Of Fixed Interest Swap Agreements [Member] \| Minimum [Member]
Subsequent Event [Line Items]
Debt Instrument, Maturity Date	Jan. 31, 2021