Natural Resource Partners (NRP) 10-K7 Mar 242023 FY Annual reportFinancial data

Company Profile

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Dec. 31, 2023	Feb. 22, 2024	Jun. 30, 2023
Document Information [Line Items]
Entity Central Index Key	0001171486
Entity Registrant Name	NATURAL RESOURCE PARTNERS LP
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	001-31465
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	35-2164875
Entity Address, Address Line One	1415 Louisiana Street, Suite 3325
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77002
City Area Code	713
Local Phone Number	751-7507
Title of 12(b) Security	Common Units representing limited partner interests
Trading Symbol	NRP
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 474,000,000
Entity Common Stock, Shares Outstanding		12,960,064
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	Houston, Texas

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 11,989	$ 39,091
Accounts receivable, net	41,086	42,701
Other current assets, net	2,218	1,822
Total current assets	55,293	83,614
Land	24,008	24,008
Mineral rights, net	394,483	412,312
Intangible assets, net	13,682	14,713
Equity in unconsolidated investment	276,549	306,470
Long-term contract receivable, net	26,321	28,946
Other long-term assets, net	7,540	7,068
Total assets	797,876	877,131
Current liabilities
Accounts payable	885	1,992
Accrued liabilities	12,987	11,916
Accrued interest	584	989
Current portion of deferred revenue	4,599	6,256
Current portion of long-term debt, net	30,785	39,076
Total current liabilities	49,840	60,229
Deferred revenue	38,356	40,181
Long-term debt, net	124,273	129,205
Other non-current liabilities	7,172	5,472
Total liabilities	219,641	235,087
Commitments and contingencies (see Note 15)
Class A Convertible Preferred Units (71,666 and 250,000 units issued and outstanding at December 31, 2023 and 2022, respectively, at $1,000 par value per unit; liquidation preference of $1,850 per unit at December 31, 2023 and 2022) (See Note 4)	47,181	164,587
Partners’ capital
Common unitholders’ interest (12,634,642 and 12,505,996 units issued and outstanding at December 31, 2023 and 2022, respectively)	503,076	404,799
General partner’s interest	8,005	5,977
Warrants and Rights Outstanding	23,095	47,964
Accumulated other comprehensive income (loss)	(3,122)	18,717
Total partners' capital	531,054	477,457
Total liabilities and partners' capital	$ 797,876	$ 877,131

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2023	Dec. 31, 2022
Temporary Equity, shares issued (in shares)	71,666	250,000
Temporary Equity, shares outstanding (in shares)	71,666	250,000
Temporary Equity, par value (in dollars per share)	$ 1,000	$ 1,000
Temporary Equity, liquidation (in dollars per share)	$ 1,850	$ 1,850
Common unitholders interest, issued (in shares)	12,634,642	12,505,996
Common unitholders interest, outstanding (in shares)	12,634,642	12,505,996

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Revenues and other income
Equity in earnings of Sisecam Wyoming		$ 73,397		$ 59,795		$ 21,871
Gain on asset sales and disposals		2,956		1,082		245
Total revenues and other income		370,009		388,962		216,364
Operating expenses
Operating and maintenance expenses		32,315		34,903		27,049
Depreciation, depletion and amortization		18,489		22,519		19,075
General and administrative expenses		26,111		21,852		17,360
Asset impairments		556		4,457		5,102
Total operating expenses		77,471		83,731		68,586
Income from operations		292,538		305,231		147,778
Other expenses, net
Interest expense, net		(14,103)		(26,274)		(38,876)
Loss on extinguishment of debt		0		(10,465)		0
Total other expenses, net		(14,103)		(36,739)		(38,876)
Net income		278,435	[1]	268,492	[2]	108,902	[3]
Less: income attributable to preferred unitholders		(16,719)		(30,000)		(31,609)
Less: redemption of preferred units		(60,929)		0		0
Net income attributable to common unitholders and the general partner		200,787		238,492		77,293
Net income attributable to common unitholders		196,771		233,722		75,747
Net income attributable to the general partner		$ 4,016		$ 4,770		$ 1,546
Net income per common unit (see Note 6)
Basic (in dollars per share)		$ 15.59		$ 18.72		$ 6.14
Diluted (in dollars per share)		$ 13.08		$ 13.39		$ 4.81
Net income		$ 278,435	[1]	$ 268,492	[2]	$ 108,902	[3]
Comprehensive income (loss) from unconsolidated investment and other		(21,839)		15,506		2,889
Comprehensive income		256,596		283,998		111,791
Mineral Rights Segment [Member]
Operating expenses
Depreciation, depletion and amortization		17,300		20,900		17,600
Royalty and Other Mineral Rights [Member] \| Mineral Rights Segment [Member]
Revenues and other income
Revenues		278,733		307,013		185,196
Transportation and Processing Services [Member] \| Mineral Rights Segment [Member]
Revenues and other income
Revenues	[4]	$ 14,923		$ 21,072		$ 9,052

[1]Net income includes $16.7 million of income attributable to preferred unitholders that accumulated during the period, of which $16.4 million is allocated to the common unitholders and $0.3 million is allocated to the general partner.[2]Net income includes $30.0 million of income attributable to preferred unitholders that accumulated during the period, of which $29.4 million is allocated to the common unitholders and $0.6 million is allocated to the general partner.[3]Net income includes $31.6 million of income attributable to preferred unitholders that accumulated during the period, of which $31.0 million is allocated to the common unitholders and $0.6 million is allocated to the general partner.[4]Transportation and processing services revenues from contracts with customers as defined under ASC 606 was $12.4 million, $17.9 million and $5.4 million for the year ended December 31, 2023, 2022 and 2021, respectively. The remaining transportation and processing services revenues of $2.5 million, $3.2 million and $3.6 million for the year ended December 31, 2023, 2022 and 2021, respectively, related to other NRP-owned infrastructure leased to and operated by third-party operators accounted for under other guidance. See Note 17. Financing Transaction for more information.

Consolidated Statements of Part

Consolidated Statements of Partners' Capital - USD ($) shares in Thousands, $ in Thousands		Total	AOCI Attributable to Parent [Member]	Limited Partner [Member]	General Partner [Member]	Warrant Holder [Member]
Balance (in shares) at Dec. 31, 2020				12,261
Balance at Dec. 31, 2020		$ 204,524	$ 322	$ 136,927	$ 459	$ 66,816
Net income	[1]	108,902		106,724	2,178
Distributions to common unitholders and the general partner		(22,645)		(22,192)	(453)
Distributions to preferred unitholders		(31,142)		$ (30,519)	(623)
Issuance of unit-based awards (in shares)	[2]			90
Unit-based awards amortization and vesting, net		2,647		$ 2,647
Capital contribution		32			32
Warrant settlement		(9,183)		$ 9,475	194	(18,852)
Comprehensive income from unconsolidated investment and other		2,889	2,889
Balance (in shares) at Dec. 31, 2021				12,351
Balance at Dec. 31, 2021		256,024	3,211	$ 203,062	1,787	47,964
Net income	[3]	268,492		263,122	5,370
Distributions to common unitholders and the general partner		(34,384)		(33,697)	(687)
Distributions to preferred unitholders		(30,258)		$ (29,653)	(605)
Issuance of unit-based awards (in shares)				155
Unit-based awards amortization and vesting, net		1,965		$ 1,965
Capital contribution		112			112
Comprehensive income from unconsolidated investment and other		15,506	15,506
Balance (in shares) at Dec. 31, 2022				12,506
Balance at Dec. 31, 2022		477,457	18,717	$ 404,799	5,977	47,964
Net income	[2]	278,435		272,866	5,569
Distributions to common unitholders and the general partner		(69,908)		(68,510)	(1,398)
Distributions to preferred unitholders		(22,069)		$ (21,628)	(441)
Issuance of unit-based awards (in shares)				129
Unit-based awards amortization and vesting, net		5,854		$ 5,854
Capital contribution		142			142
Warrant settlement		(56,089)		(30,595)	(625)	(24,869)
Comprehensive income from unconsolidated investment and other		(21,839)	(21,839)
Redemptions of preferred units		(60,929)		$ (59,710)	(1,219)
Balance (in shares) at Dec. 31, 2023				12,635
Balance at Dec. 31, 2023		$ 531,054	$ (3,122)	$ 503,076	$ 8,005	$ 23,095

[1]Net income includes $31.6 million of income attributable to preferred unitholders that accumulated during the period, of which $31.0 million is allocated to the common unitholders and $0.6 million is allocated to the general partner.[2]Net income includes $16.7 million of income attributable to preferred unitholders that accumulated during the period, of which $16.4 million is allocated to the common unitholders and $0.3 million is allocated to the general partner.[3]Net income includes $30.0 million of income attributable to preferred unitholders that accumulated during the period, of which $29.4 million is allocated to the common unitholders and $0.6 million is allocated to the general partner.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Cash flows from operating activities
Net income	$ 278,435	[1]	$ 268,492	[2]	$ 108,902	[3]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	18,489		22,519		19,075
Distributions from unconsolidated investment	81,478		44,835		11,270
Equity earnings from unconsolidated investment	(73,397)		(59,795)		(21,871)
Gain on asset sales and disposals	(2,956)		(1,082)		(245)
Loss on extinguishment of debt	0		10,465		0
Asset impairments	556		4,457		5,102
Bad debt expense	2,244		1,062		2,572
Unit-based compensation expense	10,910		5,773		4,039
Amortization of debt issuance costs and other	1,303		2,410		2,265
Change in operating assets and liabilities:
Accounts receivable	(164)		(18,671)		(14,415)
Accounts payable	(1,108)		37		570
Accrued liabilities	(225)		935		3,020
Accrued interest	(406)		(224)		(501)
Deferred revenue	(3,483)		(15,424)		307
Other items, net	(698)		1,049		1,714
Net cash provided by operating activities	310,978		266,838		121,804
Cash flows from investing activities
Proceeds from asset sales and disposals	2,963		1,083		249
Return of long-term contract receivable	2,463		1,723		2,163
Capital expenditures	(10)		(118)		0
Net cash provided by investing activities	5,416		2,688		2,412
Cash flows from financing activities
Debt borrowings	248,834		70,000		0
Debt repayments	(262,396)		(339,396)		(39,396)
Redemptions of preferred units	(178,334)		0		0
Redemption of preferred units paid-in-kind	0		(19,321)		0
Warrant settlements	(56,089)		0		(9,183)
Acquisition of non-controlling interest in BRP	0		0		(1,000)
Other items, net	(3,534)		(12,596)		(691)
Net cash used in financing activities	(343,496)		(365,955)		(88,486)
Net increase (decrease) in cash and cash equivalents	(27,102)		(96,429)		35,730
Cash and cash equivalents at beginning of period	39,091		135,520		99,790
Cash and cash equivalents at end of period	11,989		39,091		135,520
Supplemental cash flow information:
Cash paid for interest	13,856		25,265		37,378
Non-cash investing and financing activities:
Preferred unit distributions paid-in-kind	0		0		15,571
Common Unitholders And General Partner [Member]
Cash flows from financing activities
Distributions to unitholders	(69,908)		(34,384)		(22,645)
Preferred Partner [Member]
Cash flows from financing activities
Distributions to unitholders	$ (22,069)		$ (30,258)		$ (15,571)

[1]Net income includes $16.7 million of income attributable to preferred unitholders that accumulated during the period, of which $16.4 million is allocated to the common unitholders and $0.3 million is allocated to the general partner.[2]Net income includes $30.0 million of income attributable to preferred unitholders that accumulated during the period, of which $29.4 million is allocated to the common unitholders and $0.6 million is allocated to the general partner.[3]Net income includes $31.6 million of income attributable to preferred unitholders that accumulated during the period, of which $31.0 million is allocated to the common unitholders and $0.6 million is allocated to the general partner.

Note 1 - Organization and Natur

Note 1 - Organization and Nature of Operations	12 Months Ended
Note 1 - Organization and Nature of Operations	Dec. 31, 2023
Notes to Financial Statements
Basis of Presentation and Significant Accounting Policies [Text Block]	1. Organization and Nature of Operations Natural Resource Partners L.P. (the "Partnership"), a Delaware limited partnership, was formed in April 2002. two Note 7. The Partnership’s operations are conducted through, and its operating assets are owned by, its subsidiaries. The Partnership owns its subsidiaries through one one 2023, no

Note 2 - Summary of Significant

Note 2 - Summary of Significant Accounting Policies	12 Months Ended
Note 2 - Summary of Significant Accounting Policies	Dec. 31, 2023
Notes to Financial Statements
Significant Accounting Policies [Text Block]	2. Summary of Significant Accounting Policies Basis of Presentation The accompanying Consolidated Financial Statements of the Partnership have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP"). The Consolidated Financial Statements include the accounts of Natural Resource Partners L.P. and its wholly owned subsidiaries. The Partnership has an equity investment in Sisecam Wyoming through which it is able to exercise significant influence over but does not not no Use of Estimates Preparation of the accompanying financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities on the accompanying Consolidated Balance Sheets, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses on the accompanying Consolidated Statements of Comprehensive Income during the reporting period. Actual results could differ from those estimates. The most significant estimates pertain to coal and aggregates mineral rights and related cash flow estimates which are used to compute depreciation, depletion and amortization and impairments of coal and aggregates properties and related intangible assets and commitments and contingencies. Fair Value The Partnership discloses certain assets and liabilities using fair value as defined by authoritative guidance. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. See Note 12. There are three may • Level 1—Quoted • Level 2—Observable 1 not • Level 3—Unobservable no 3 Cash and Cash Equivalents The Partnership considers all highly liquid short-term investments with an original maturity of three Allowance for Doubtful Accounts The Partnership records an allowance for doubtful accounts for its accounts receivable and notes receivable comprised of estimated credit risk and non-credit risk (e.g., legal disputes) losses. Receivables are written off when collection efforts are exhausted and future recovery is doubtful. The Partnership includes an allowance for current expected credit losses ("CECL") on its financial assets based on the loss-rate method. NRP assesses the likelihood of collection of its receivables utilizing historical loss rates, current market conditions, industry and macroeconomic factors, reasonable and supportable forecasts and facts or circumstances of individual customers and properties. See Note 18. million a December 31, 2023 2022 December 31, 2023 2022 million December 31, 2023 2022 million, December 31, 2023, 2022 2021 Mineral Rights Mineral rights owned and leased are recorded at its original cost of construction or, upon acquisition, at fair value of the assets acquired. Coal and aggregates mineral rights are depleted on a unit-of-production basis by lease, based upon minerals mined in relation to the net cost of the mineral properties and estimated economic tonnage therein. Intangible Assets The Partnership’s intangible assets consist of mineral royalty and transportation contracts that at acquisition were more favorable for the Partnership than prevailing market rates, known as above-market contracts. The estimated fair value of the above-market rate contracts are determined based on the present value of future cash flow projections related to the underlying assets acquired. Intangible assets are amortized on a unit-of-production basis by asset based upon minerals mined or transported in relation to the net book value of the intangible asset and estimated economic tonnage expected to be mined or transported during the above-market contract term. Asset Impairment The Partnership has developed procedures to evaluate its long-lived assets, including intangible assets, for possible impairment periodically or whenever events or changes in circumstances indicate an asset's net book value may not not The Partnership evaluates its equity investment for impairment when events or changes in circumstances indicate, in management’s judgment, that the carrying value of such investment may 1 3 3 Accrued Liabilities Included in accrued liabilities on the Partnership's Consolidated Balance Sheets at December 31, 2023 million of accrued employee costs and million of accrued property taxes. December 31, 2022 Revenue Recognition Mineral Rights Segment Revenues Royalty-based leases. two five three five The Partnership has defined its coal and aggregates royalty lease performance obligation as providing the lessee the right to mine and sell its coal or aggregates over the lease term. NRP then evaluated the likelihood that consideration it expected to receive from its lessees resulting from production would exceed consideration expected to be received from minimum payments over the lease term. As a result of this evaluation, revenue recognition from the Partnership's royalty-based leases is based on either production or minimum payments as follows: • Production Leases • Minimum Leases This evaluation is performed at the inception of the lease and only reassessed upon modification or renewal of the lease. Oil and gas related revenues consist of revenues from royalties and overriding royalties and are recognized on the basis of volume of hydrocarbons sold by lessees and the corresponding revenues from those sales. Also, included within oil and gas royalty revenues are lease bonus payments, which are generally paid upon the execution of a lease. The Partnership also has overriding royalty revenue interests in certain coal and aggregates mineral rights. Revenue from these interests is recognized over time based on when the coal is sold. Carbon neutral initiatives. Wheelage revenues. Other revenues. Transportation and processing services revenues. third Contract Modifications Contract modifications that impact goods or services or the transaction price are evaluated in accordance with ASC 606. not Contract Assets and Liabilities from Contracts with Customers Contract assets include receivables from contracts with customers and are recorded when the right to consideration becomes unconditional. Receivables are recognized when the minimums are contractually owed, production occurs or minimums accrued for based on the passage of time. Contract liabilities represent minimum consideration received, contractually owed or earned based on the passage of time. The current portion of deferred revenue relates to deferred revenue on minimum leases and lease amendment fees that are to be recognized as revenue on a straight-line basis over the next twelve twelve twelve Equity in Earnings of Sisecam Wyoming The Partnership accounts for non-marketable equity investments using the equity method of accounting if the investment gives it the ability to exercise significant influence over, but not Property Taxes The Partnership is responsible for paying property taxes on the properties it owns. Typically, the lessees are contractually responsible for reimbursing the Partnership for property taxes on the leased properties. The payment of and reimbursement of property taxes is included in operating and maintenance expenses and in royalty and other mineral rights revenues, respectively, on the Consolidated Statements of Comprehensive Income. Unit-Based Compensation The Partnership has awarded unit-based compensation in the form of equity-based awards and phantom units. The Partnership's service and performance-based awards are valued using the closing price of NRP's units as of the grant date while the Partnership's market-based awards are valued using a Monte Carlo simulation. Compensation cost is remeasured each reporting period for liability-classified awards based on the fair value of an award and is recognized over the service period, which is generally the vesting period. Forfeitures are recognized as they occur. Unit-based compensation expense for all awards is recognized in general and administrative expenses and operating and maintenance expenses on the Consolidated Statements of Comprehensive Income. See Note 16. Deferred Financing Costs Deferred financing costs consist of legal and other costs related to the issuance of the Partnership’s debt. These costs are amortized over the term of the respective line-of-credit or debt arrangements. Deferred financing costs related to the Partnership's revolving credit facility are included in other long-term assets, net on the Partnership's Consolidated Balance Sheets. Deferred financing costs related to the Partnership's note agreements are included as a direct deduction from the carrying amount of the debt liability in current portion of long-term debt, net or long-term debt, net on the Partnership's Consolidated Balance Sheets. Income Taxes The Partnership is not may Recently Adopted Accounting Standard On January 1, 2023, 2020 06, 470 20 815 40 2020 06 not Note 6. Net Income Per Common Unit Note 4. Class A Convertible Preferred Units and Warrants Recently Issued Accounting Standard In November 2023, ASU No. 2023 07 Segment Reporting (Topic 280 2023 07" 2023 07 December 15, 2023 not 2023 07

Note 3 - Revenues From Contract

Note 3 - Revenues From Contracts With Customers	12 Months Ended
Note 3 - Revenues From Contracts With Customers	Dec. 31, 2023
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	3. Revenues from Contracts with Customers The following table represents the Partnership's Mineral Rights segment revenues by major source: For the Year Ended December 31, (In thousands) 2023 2022 2021 Coal royalty revenues $ 218,011 $ 226,956 $ 104,089 Production lease minimum revenues 3,322 5,854 14,269 Minimum lease straight-line revenues 19,389 18,792 20,564 Carbon neutral initiative revenues 2,969 8,600 13,790 Property tax revenues 6,219 5,878 6,028 Wheelage revenues 12,191 13,961 10,065 Coal overriding royalty revenues 2,175 3,434 4,367 Lease amendment revenues 3,070 3,201 4,696 Aggregates royalty revenues 2,876 3,299 1,889 Oil and gas royalty revenues 7,387 16,161 4,506 Other revenues 1,124 877 933 Royalty and other mineral rights revenues $ 278,733 $ 307,013 $ 185,196 Transportation and processing services revenues (1) 14,923 21,072 9,052 Total Mineral Rights segment revenues $ 293,656 $ 328,085 $ 194,248 ( 1 Transportation and processing services revenues from contracts with customers as defined under ASC 606 million, $1 7.9 December 31, 2023, 2022 2021 , $ December 31, 2023, 2022 2021 third Note 17. The following table details the Partnership's Mineral Rights segment receivables and liabilities resulting from contracts with customers: December 31, (In thousands) 2023 2022 Receivables Accounts receivable, net $ 37,206 $ 39,004 Other current assets, net (1) 429 — Other long-term assets, net (2) — 75 Contract liabilities Current portion of deferred revenue $ 4,599 $ 6,256 Deferred revenue 38,356 40,181 ( 1 Other current assets, net includes short-term notes receivables from contracts with customers. ( 2 Other long-term assets, net includes long-term lease amendment fee receivables from contracts with customers. The following table shows the activity related to the Partnership's Mineral Rights segment deferred revenue: For the Year Ended December 31, (In thousands) 2023 2022 2021 Balance at beginning of period (current and non-current) $ 46,437 $ 61,862 $ 61,554 Increase due to minimums and lease amendment fees 17,526 19,073 19,842 Recognition of previously deferred revenue (21,008 ) (34,498 ) (19,534 ) Balance at end of period (current and non-current) $ 42,955 $ 46,437 $ 61,862 The Partnership's non-cancelable annual minimum payments due under the lease terms of its coal and aggregates royalty and overriding royalty leases are as follows as of December 31, 2023 Lease Term (1) Weighted Average Remaining Years Annual Minimum Payments 0 - 5 years 1.8 $ 17,477 5 - 10 years 6.1 18,655 10+ years 12.0 25,779 Total 7.4 $ 61,911 ( 1 Lease term does not

Note 4 - Class A Convertible Pr

Note 4 - Class A Convertible Preferred Units and Warrants	12 Months Ended
Note 4 - Class A Convertible Preferred Units and Warrants	Dec. 31, 2023
Notes to Financial Statements
Preferred Stock [Text Block]	4. On March 2, 2017, one may NRP also issued two may eighth may, After March 2, 2022 March 2, 2025, may 12 30 30 On or after March 2, 2025, may 30 1 March 2, 2020, March 2, 2020 March 2, 2021, March 2, 2021, 2 To the extent the holders of the preferred units have not March 2, 2029, 30 In addition, NRP has the ability to redeem at any time (subject to compliance with its debt agreements) all or any portion of the preferred units and any outstanding PIK units for cash. The redemption price for each outstanding PIK unit is $1,000 plus the value of any accrued and unpaid distributions per PIK unit. The redemption price for each preferred unit is the liquidation value divided by the number of outstanding preferred units. The preferred units are redeemable at the option of the preferred purchasers only upon a change in control. The terms of the preferred units contain certain restrictions on NRP's ability to pay distributions on its common units. To the extent that either (i) NRP's consolidated Leverage Ratio, as defined in the Partnership's Fifth Amended and Restated Partnership Agreement dated March 2, 2017 ( 3.25x, 1.2x four may not January 1, 2022, may not The holders of the preferred units have the right to vote with holders of NRP’s common units on an as-converted basis and have other customary approval rights with respect to changes of the terms of the preferred units. In addition, pursuant to the Restated Partnership Agreement, Blackstone had certain approval rights over certain matters as identified in the Restated Partnership Agreement. GoldenTree has limited approval rights that expanded when Blackstone's ownership fell below the minimum preferred unit threshold (as defined below). These approval rights are not no not At the closing, pursuant to the Board Rights Agreement, the Preferred Purchasers received certain board appointment and observation rights, and Blackstone appointed one one 2023, no not one 30 no no NRP also entered into a registration rights agreement (the "preferred unit and warrant registration rights agreement") with the preferred purchasers, pursuant to which NRP is required to file (i) a shelf registration statement to register the common units issuable upon exercise of the warrants and to cause such registration statement to become effective not 90 not fifth 90 first April 20, 2017. February 11, 2022. Accounting for the Preferred Units and Warrants Classification The preferred units are accounted for as temporary equity on NRP's Consolidated Balance Sheets due to certain contingent redemption rights that may Initial Measurement The net transaction price was allocated to the preferred units and warrants based on their relative fair values at inception date. NRP allocated the transaction issuance costs to the preferred units and warrants primarily on a pro-rata basis based on their relative inception date allocated values. Subsequent Measurement Preferred Units Subsequent adjustment of the preferred units will not first In 2023, 2023, December 31, 2023. no Activity related to the preferred units is as follows: Units Financial (In thousands, except unit data) Outstanding Position Balance at December 31, 2020 253,750 $ 168,337 Distribution paid-in-kind 15,571 15,571 Balance at December 31, 2021 269,321 $ 183,908 Redemption of preferred units paid-in-kind (19,321 ) (19,321 ) Balance at December 31, 2022 250,000 $ 164,587 Redemption of preferred units (178,334 ) (117,406 ) Balance at December 31, 2023 71,666 $ 47,181 Warrants Subsequent adjustment of the warrants will not may, In 2023, December 31, 2023, December 31, 2022, $34.00. $48.0 December 31, 2023 December 31, 2022, On November 10, 2021 ( 15 Activity related to the warrants is as follows: Warrants Financial (In thousands, except warrant data) Outstanding Position Balance at December 31, 2020 4,000,000 $ 66,816 Warrant settlement (997,500 ) (18,852 ) Balance at December 31, 2021 and 2022 3,002,500 $ 47,964 Warrant settlement (1,462,500 ) (24,869 ) Balance at December 31, 2023 1,540,000 $ 23,095 On January 29, 2024 ( "January 2024 15 January 2024 February 7, 2024 "February 7, 2024 15 February 7, 2024 February 8, 2024 ( "February 8, 2024 15 February 8, 2024 February 14, 2024 "February 14, 2024 15 February 14, 2024 first 2024. Certain embedded features within the preferred unit and warrant purchase agreement are accounted for at fair value and are remeasured each quarter. See Note 12.

Note 5 - Common and Preferred U

Note 5 - Common and Preferred Unit Distributions	12 Months Ended
Note 5 - Common and Preferred Unit Distributions	Dec. 31, 2023
Notes to Financial Statements
Partners' Capital Notes Disclosure [Text Block]	5. Common and Preferred Unit Distributions The Partnership makes distributions to common and preferred unitholders on a quarterly basis, subject to approval by the Board of Directors. NRP recognizes both common unit and preferred unit distributions on the date the distribution is declared. Distributions made on the common units and the general partner's general partner ("GP") interest are made on a pro-rata basis in accordance with their relative percentage interests in the Partnership. The general partner is entitled to receive 2% of such distributions. Income available to common unitholders and the general partner is adjusted by preferred unit distributions that accumulated during the period. NRP adjusted net income available to common unitholders and the general partner by $16.7 million, $30.0 million and $31.6 million during the year ended December 31, 2023, 2022 2021 December 31, 2023. The following table shows the distributions declared and paid to common and preferred unitholders during the year ended December 31, 2023, 2022 2021 Cash Distributions Paid-in-kind Distributions Common Units Preferred Units Total Total Total Distribution Distribution (1) Distribution Distribution Distribution Date Paid Period Covered by Distribution per Unit (In thousands) per Unit (In thousands) (In units) 2023 February October 1 - December 31, 2022 $ 0.75 $ 9,571 $ 30.00 $ 7,500 — February (2) January 1 - February 8, 2023 — — 12.33 586 — March (3) Special Distribution 2.43 31,329 — — — May January 1 - March 31, 2023 0.75 9,669 30.00 6,075 — May (4) April 1 - May 5, 2023 — — 11.33 406 — June (5) April 1 - June 2, 2023 — — 20.33 915 — August April 1 - June 30, 2023 0.75 9,669 30.00 3,650 — August (6) June 30 - August 8, 2023 — — 12.33 432 — September (7) June 30 - September 12, 2023 — — 23.67 355 — November July 1 - September 30, 2023 0.75 9,670 30.00 2,150 — 2022 February October 1 - December 31, 2021 $ 0.45 $ 5,672 $ 30.00 $ 7,500 — February (8) January 1 - February 8, 2022 — — 13.35 258 — May January 1 - March 31, 2022 0.75 9,570 30.00 7,500 — August April 1 - June 30, 2022 0.75 9,571 30.00 7,500 — November July 1 - September 30, 2022 0.75 9,571 30.00 7,500 — 2021 February October 1 - December 31, 2020 $ 0.45 $ 5,630 $ 15.00 $ 3,806 3,806 May January 1 - March 31, 2021 0.45 5,672 15.00 3,864 3,864 August April 1 - June 30, 2021 0.45 5,671 15.00 3,921 3,921 November July 1 - September 30, 2021 0.45 5,672 15.00 3,980 3,980 ( 1 Totals include the amount paid to NRP's general partner in accordance with the general partner's 2% ( 2 Relates to accrued distribution paid upon the redemption of 47,499 preferred units in February 2023. ( 3 Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2022. ( 4 Relates to accrued distribution paid upon the redemption of 35,834 preferred units in May 2023. ( 5 Relates to accrued distribution paid upon the redemption of 45,000 preferred units in June 2023. ( 6 Relates to accrued distribution paid upon the redemption of 35,000 preferred units in August 2023. ( 7 Relates to accrued distribution paid upon the redemption of 15,001 preferred units in September 2023. ( 8 Relates to accrued distribution paid upon the redemption of 19,321 preferred units paid-in-kind in February 2022.

Note 6 - Net Income Per Common

Note 6 - Net Income Per Common Unit	12 Months Ended
Note 6 - Net Income Per Common Unit	Dec. 31, 2023
Notes to Financial Statements
Earnings Per Share [Text Block]	6. Basic net income per common unit is computed by dividing net income, after considering income attributable to preferred unitholders, the difference between the fair value of the consideration paid upon redemption and the carrying value of the preferred units, and the general partner’s general partner interest, by the weighted average number of common units outstanding. Diluted net income per common unit includes the effect of NRP's preferred units, warrants, and unvested unit-based awards if the inclusion of these items is dilutive. The dilutive effect of the preferred units is calculated using the if-converted method. Under the if-converted method, the preferred units are assumed to be converted at the beginning of the period, and the resulting common units are included in the denominator of the diluted net income per unit calculation for the period being presented. Distributions declared in the period and undeclared distributions on the preferred units that accumulated during the period are added back to the numerator for purposes of the if-converted calculation. The calculation of diluted net income per common unit for the year ended December 31, 2023 not December 31, 2023 December 31, 2022 2021 The dilutive effect of the warrants is calculated using the treasury stock method, which assumes that the proceeds from the exercise of these instruments are used to purchase common units at the average market price for the period. The calculation of diluted net income per common unit for the year ended December 31, 2023 December 31, 2022 $34.00. December 31, 2021 not The following table reconciles the numerators and denominators of the basic and diluted net income per common unit computations and calculates basic and diluted net income per common unit: For the Year Ended December 31, (In thousands, except per unit data) 2023 2022 2021 Basic net income per common unit Net income attributable to common unitholders $ 196,771 $ 233,722 $ 75,747 Weighted average common units—basic 12,619 12,484 12,337 Basic net income per common unit $ 15.59 $ 18.72 $ 6.14 Diluted net income per common unit Weighted average common units—basic 12,619 12,484 12,337 Plus: dilutive effect of preferred units 2,059 6,176 9,604 Plus: dilutive effect of warrants 1,202 783 74 Plus: dilutive effect of unvested unit-based awards 216 210 178 Weighted average common units—diluted 16,096 19,653 22,193 Net income $ 278,435 $ 268,492 $ 108,902 Less: income attributable to preferred unitholders (2,694 ) — — Less: redemption of preferred units (60,929 ) — — Diluted net income attributable to common unitholders and the general partner $ 214,812 $ 268,492 $ 108,902 Less: diluted net income attributable to the general partner (4,296 ) (5,370 ) (2,178 ) Diluted net income attributable to common unitholders $ 210,516 $ 263,122 $ 106,724 Diluted net income per common unit $ 13.08 $ 13.39 $ 4.81

Note 7 - Segment Information

Note 7 - Segment Information	12 Months Ended
Note 7 - Segment Information	Dec. 31, 2023
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	7. Segment Information The Partnership's segments are strategic business units that offer distinct products and services to different customers in different geographies within the U.S. and that are managed accordingly. NRP has the following two Mineral Rights Soda Ash Direct segment costs and certain other costs incurred at the corporate level that are identifiable and that benefit the Partnership's segments are allocated to the operating segments accordingly. These allocated costs generally include salaries and benefits, insurance, property taxes, legal, royalty, information technology and shared facilities services and are included in operating and maintenance expenses on the Partnership's Consolidated Statements of Comprehensive Income. Corporate and Financing includes functional corporate departments that do not not The following table summarizes certain financial information for each of the Partnership's business segments: Operating Segments (In thousands) Mineral Rights Soda Ash Corporate and Financing Total For the Year Ended December 31, 2023 Revenues $ 293,656 $ 73,397 $ — $ 367,053 Gain on asset sales and disposals 2,956 — — 2,956 Operating and maintenance expenses 32,058 257 — 32,315 Depreciation, depletion and amortization 18,471 — 18 18,489 General and administrative expenses — — 26,111 26,111 Asset impairments 556 — — 556 Other expenses, net — — 14,103 14,103 Net income (loss) 245,527 73,140 (40,232 ) 278,435 As of December 31, 2023 Total assets $ 516,844 $ 276,549 $ 4,483 $ 797,876 For the Year Ended December 31, 2022 Revenues $ 328,085 $ 59,795 $ — $ 387,880 Gain on asset sales and disposals 1,082 — — 1,082 Operating and maintenance expenses 34,743 160 — 34,903 Depreciation, depletion and amortization 22,519 — — 22,519 General and administrative expenses — — 21,852 21,852 Asset impairments 4,457 — — 4,457 Other expenses, net — — 36,739 36,739 Net income (loss) 267,448 59,635 (58,591 ) 268,492 As of December 31, 2022 Total assets $ 566,615 $ 306,470 $ 4,046 $ 877,131 For the Year Ended December 31, 2021 Revenues $ 194,248 $ 21,871 $ — $ 216,119 Gain on asset sales and disposals 245 — — 245 Operating and maintenance expenses 26,880 169 — 27,049 Depreciation, depletion and amortization 19,075 — — 19,075 General and administrative expenses — — 17,360 17,360 Asset impairments 5,102 — — 5,102 Other expenses, net 24 — 38,852 38,876 Net income (loss) 143,412 21,702 (56,212 ) 108,902

Note 8 - Equity Investment

Note 8 - Equity Investment	12 Months Ended
Note 8 - Equity Investment	Dec. 31, 2023
Notes to Financial Statements
Equity Method Investments and Joint Ventures Disclosure [Text Block]	8. Equity Investment The Partnership accounts for its 49% investment in Sisecam Wyoming using the equity method of accounting. Activity related to this investment is as follows: For the Year Ended December 31, (In thousands) 2023 2022 2021 Balance at beginning of period $ 306,470 $ 276,004 $ 262,514 Income allocation to NRP’s equity interests (1) 78,179 64,712 26,979 Amortization of basis difference (4,783 ) (4,917 ) (5,108 ) Other comprehensive income (loss) (21,839 ) 15,506 2,889 Distributions (81,478 ) (44,835 ) (11,270 ) Balance at end of period $ 276,549 $ 306,470 $ 276,004 ( 1 Amounts reclassified into income out of accumulated other comprehensive loss were $(17.9) million, $(6.8) million and $0.0 million for the year ended December 31, 2023, 2022 2021 The difference between the amount at which the investment in Sisecam Wyoming is carried and the amount of underlying equity in Sisecam Wyoming's net assets was $116.6 million and $ December 31, 2023 2022 27 years. The following table represents summarized financial information for Sisecam Wyoming as derived from their respective financial statements for the years ended December 31, 2023 2022 2021 For the Year Ended December 31, (In thousands) 2023 2022 2021 Net sales $ 773,590 $ 720,120 $ 540,139 Gross profit 187,929 162,575 80,550 Net income 159,549 132,065 55,059 The financial position of Sisecam Wyoming is summarized as follows: December 31, (In thousands) 2023 2022 Current assets $ 253,754 $ 340,437 Noncurrent assets 284,131 292,915 Current liabilities 91,853 111,258 Noncurrent liabilities 119,533 144,290

Note 9 - Mineral Rights, Net

Note 9 - Mineral Rights, Net	12 Months Ended
Note 9 - Mineral Rights, Net	Dec. 31, 2023
Notes to Financial Statements
Mineral Industries Disclosures [Text Block]	9. Mineral Rights, Net The Partnership’s mineral rights consist of the following: December 31, 2023 2022 (In thousands) Carrying Value Accumulated Depletion Net Book Value Carrying Value Accumulated Depletion Net Book Value Coal properties $ 661,256 $ (285,470 ) $ 375,786 $ 661,812 $ (269,037 ) $ 392,775 Aggregates properties 8,655 (3,761 ) 4,894 8,655 (3,410 ) 5,245 Oil and gas royalty properties 12,354 (10,082 ) 2,272 12,354 (9,600 ) 2,754 Other 13,143 (1,612 ) 11,531 13,150 (1,612 ) 11,538 Total mineral rights, net $ 695,408 $ (300,925 ) $ 394,483 $ 695,971 $ (283,659 ) $ 412,312 Depletion expense related to the Partnership’s mineral rights is included in depreciation, depletion and amortization on its Consolidated Statements of Comprehensive Income and totaled $17.3 million, $20.9 million and $17.6 million for the year ended December 31, 2023, 2022 2021 Impairment of Mineral Rights During the years ended December 31, 2023, 2022 2021 For the Year Ended December 31, (In thousands) 2023 2022 2021 Coal properties (1) $ 556 $ 4,365 $ 5,015 Aggregates properties (2) — 92 87 Total $ 556 $ 4,457 $ 5,102 ( 1 The Partnership recorded $0.6 million of impairment expense during the year ended December 31, 2023 December 31, 2022 December 31, 2022. December 31, 2022 December 31, 2021 3 ( 2 The Partnership recorded $0.1 million of aggregates royalty property impairments during the years ended December 31, 2022 2021. 3

Note 10 - Intangible Assets, Ne

Note 10 - Intangible Assets, Net	12 Months Ended
Note 10 - Intangible Assets, Net	Dec. 31, 2023
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	10. Intangible Assets, Net The Partnership's intangible assets consist of above-market coal royalty and related transportation contracts with subsidiaries of Foresight Energy Resources LLC ("Foresight") pursuant to which the Partnership receives royalty payments for coal sales and throughput fees for the transportation and processing of coal. The Partnership's intangible assets included on its Consolidated Balance Sheets are as follows: December 31, (In thousands) 2023 2022 Intangible assets at cost $ 51,353 $ 51,353 Less: accumulated amortization (37,671 ) (36,640 ) Total intangible assets, net $ 13,682 $ 14,713 Amortization expense included in depreciation, depletion and amortization on the Partnership's Consolidated Statements of Comprehensive Income was $1.0 million, December 31, 2023, 2022 2021 The estimates of amortization expense for the years ended December 31, (In thousands) Estimated Amortization Expense 2024 $ 884 2025 813 2026 753 2027 720 2028 480

Note 11 - Debt, Net

Note 11 - Debt, Net	12 Months Ended
Note 11 - Debt, Net	Dec. 31, 2023
Notes to Financial Statements
Debt Disclosure [Text Block]	11. Debt, Net The Partnership's debt consists of the following: December 31, (In thousands) 2023 2022 Opco Credit Facility $ 95,834 $ 70,000 Opco Senior Notes 5.55 $ — $ 2,366 4.73 — 6,004 5.82 12,685 25,368 8.92 4,012 8,023 5.03 34,262 45,683 5.18 8,732 11,643 Total Opco Senior Notes $ 59,691 $ 99,087 Total debt at face value $ 155,525 $ 169,087 Net unamortized debt issuance costs (467 ) (806 ) Total debt, net $ 155,058 $ 168,281 Less: current portion of long-term debt (30,785 ) (39,076 ) Total long-term debt, net $ 124,273 $ 129,205 NRP LP Debt 2025 In 2022, 2025 December 31, 2022, 2025 The 2025 April 29, 2019 ( "2025 June 30, 2025. June 30 December 30. 2025 October 30, 2021, 12 October 30, 2021, 12 October 30, 2022, 2025 2025 may 2025 2025 2025 The 2025 2025 2025 None 2025 Opco Debt All of Opco’s debt is guaranteed by its wholly owned subsidiaries and is secured by certain of the assets of Opco and its wholly owned subsidiaries, other than BRP LLC and NRP Trona LLC. As of December 31, 2023 2022 Opco Credit Facility In May 2023, August 2027. Indebtedness under the Opco Credit Facility bears interest, at Opco's option, at: • the higher of (i) the prime rate as announced by the agent bank; (ii) the federal funds rate plus 0.50%; 3.50%; • a rate equal to SOFR plus an applicable margin ranging from 3.50% to 4.50%. During the year ended December 31, 2022, December 31, 2022. December 31, 2023 December 31, 2023. December 31, 2023 2022 may The Opco Credit Facility contains financial covenants requiring Opco to maintain: • A leverage ratio of consolidated indebtedness to EBITDDA (as defined in the Opco Credit Facility) not 3.0x; • an interest coverage ratio of consolidated EBITDDA to consolidated interest expense and consolidated lease expense (in each case as defined in the Opco Credit Facility) of not 1.0. The Opco Credit Facility contains certain additional customary negative covenants that, among other items, restrict Opco’s ability to incur additional debt, grant liens on its assets, make investments, sell assets and engage in business combinations. Included in the investment covenant are restrictions upon Opco’s ability to acquire assets where Opco does not The Opco Credit Facility is collateralized and secured by liens on certain of Opco’s assets with carrying values o f $316.3 million December 31, 2023 2022 1 2 3 4 Note 17. In February 2024, Opco Senior Notes Opco has issued several series of private placement senior notes (the "Opco Senior Notes") with various interest rates and principal due dates. As of December 31, 2023 2022 million December 31, 2023, 2022 2021 The Note Purchase Agreements relating to the Opco Senior Notes contain covenants requiring Opco to: • maintain a ratio of consolidated indebtedness to consolidated EBITDDA (as defined in the note purchase agreement) of no 1.0 four • not • maintain the ratio of consolidated EBITDDA (as defined in the note purchase agreement) to consolidated fixed charges (consisting of consolidated interest expense and consolidated operating lease expense) at not 1.0. In addition, the Note Purchase Agreements include a covenant that provides that, in the event Opco or any of its subsidiaries is subject to any additional or more restrictive covenants under the agreements governing its material indebtedness (including the Opco Credit Facility and all renewals, amendments or restatements thereof), such covenants shall be deemed to be incorporated by reference in the Note Purchase Agreements and the holders of the Notes shall receive the benefit of such additional or more restrictive covenants to the same extent as the lenders under such material indebtedness agreement. The 8.92% Opco Senior Notes also provides that in the event that Opco’s leverage ratio of consolidated indebtedness to consolidated EBITDDA (as defined in the Note Purchase Agreements) exceeds 3.75 to 1.00 two 3.75 1.00. not 1.00 December 31, 2023 In September 2016, The mandatory prepayment offers described above will be made pro-rata across each series of outstanding Opco Senior Notes and will not not Consolidated Principal Payments The consolidated principal payments due are set forth below: (In thousands) Opco Senior Notes Opco Credit Facility Total 2024 $ 31,028 $ — $ 31,028 2025 14,332 — 14,332 2026 14,331 — 14,331 2027 — 95,834 95,834 2028 — — — Thereafter — — — $ 59,691 $ 95,834 $ 155,525

Note 12 - Fair Value Measuremen

Note 12 - Fair Value Measurements	12 Months Ended
Note 12 - Fair Value Measurements	Dec. 31, 2023
Notes to Financial Statements
Fair Value Disclosures [Text Block]	12. Fair Value Measurements Fair Value of Financial Assets and Liabilities The Partnership’s financial assets and liabilities consist of cash and cash equivalents, a contract receivable and debt. The carrying amounts reported on the Consolidated Balance Sheets for cash and cash equivalents approximate fair value due to their short-term nature. The Partnership uses available market data and valuation methodologies to estimate the fair value of its debt and contract receivable. The following table shows the carrying value and estimated fair value of the Partnership's debt and contract receivable: December 31, 2023 2022 Carrying Estimated Carrying Estimated (In thousands) Fair Value Hierarchy Level Value Fair Value Value Fair Value Debt: Opco Senior Notes (1) 3 $ 59,224 $ 56,533 $ 98,281 $ 96,060 Opco Credit Facility (2) 3 95,834 95,384 70,000 70,000 Assets: Contract receivable, net (current and long-term) (3) 3 $ 28,946 $ 24,492 $ 31,371 $ 24,833 ( 1 The fair value of the Opco Senior Notes was estimated by management utilizing the present value replacement method incorporating the interest rate of the Opco Credit Facility. ( 2 The fair value of the Opco Credit Facility approximates the outstanding borrowing amount because the interest rates are variable and reflective of market rates and the terms of the credit facility allow the Partnership to repay this debt at any time without penalty. ( 3 The fair value of the Partnership's contract receivable was determined based on the present value of future cash flow projections related to the underlying asset at a discount rate of 15% at December 31, 2023 2022 NRP has embedded derivatives in the preferred units related to certain conversion options, redemption features and the change of control provision that are accounted for separately from the preferred units as assets and liabilities at fair value on the Partnership's Consolidated Balance Sheets. Level 3 zero December 31, 2023 2022 Fair Value of Non-Financial Assets The Partnership discloses or recognizes its non-financial assets, such as impairments of coal and aggregates properties at fair value on a nonrecurring basis. Refer to Note 9.

Note 13 - Related Party Transac

Note 13 - Related Party Transactions	12 Months Ended
Note 13 - Related Party Transactions	Dec. 31, 2023
Notes to Financial Statements
Related Party Transactions Disclosure [Text Block]	13. Related Party Transactions Affiliates of our General Partner The Partnership’s general partner does not Direct general and administrative expenses charged to the Partnership by QMC, WPPLP and QID are included on the Partnership's Consolidated Statement of Comprehensive Income as follows: For the Year Ended December 31, (In thousands) 2023 2022 2021 Operating and maintenance expenses $ 6,747 $ 6,694 $ 6,543 General and administrative expenses 5,408 4,864 4,611 The Partnership had accounts payable to QMC of $0.4 million on its Consolidated Balance Sheets at both December 31, 2023 2022 December 31, 2023 2022 As a result of its office lease with WPPLP, the Partnership had a right-of-use asset and lease liability of $3.5 million included in other long-term assets, net and other non-current liabilities, respectively, on its Consolidated Balance Sheets at both December 31, 2023 2022. During the years ended December 31, 2023, 2022 2021

Note 14 - Major Customers

Note 14 - Major Customers	12 Months Ended
Note 14 - Major Customers	Dec. 31, 2023
Notes to Financial Statements
Concentration Risk Disclosure [Text Block]	14. Major Customers Revenues from customers that exceeded 10 For the Year Ended December 31, 2023 2022 2021 (In thousands) Revenues Percent Revenues Percent Revenues Percent Alpha Metallurgical Resources, Inc. (1) $ 86,118 23 % $ 102,352 26 % $ 49,440 23 % Foresight (1) (2) 60,495 16 % 65,597 17 % 37,366 17 % ( 1 Revenues from Alpha Metallurgical Resources, Inc. and Foresight are included within the Partnership's Mineral Rights segment. ( 2 Revenues from Foresight in 2021 2022 2023

Note 15 - Commitments and Conti

Note 15 - Commitments and Contingencies	12 Months Ended
Note 15 - Commitments and Contingencies	Dec. 31, 2023
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	15. Commitments and Contingencies Legal NRP is involved, from time to time, in various legal proceedings arising in the ordinary course of business. While the ultimate results of these proceedings cannot be predicted with certainty, Partnership management believes these ordinary course matters will not Environmental Compliance The operations the Partnership’s lessees conduct on its properties, as well as the industrial minerals, aggregates and oil and gas operations in which the Partnership has interests, are subject to federal and state environmental laws and regulations. See " Items 1. 2. may not December 31, 2023 not may not not As a former owner of the working interests in oil and natural gas operations, the Partnership is responsible for its proportionate share of any losses and liabilities, including environmental liabilities, arising from uninsured and underinsured events during the period it was an owner.

Note 16 - Unit-based Compensati

Note 16 - Unit-based Compensation	12 Months Ended
Note 16 - Unit-based Compensation	Dec. 31, 2023
Notes to Financial Statements
Share-Based Payment Arrangement [Text Block]	16. Unit-Based Compensation 2017 In December 2017, 2017 “2017 January 2018. 2017 March 2022, 2017 2017 2017 Employees, consultants and non-employee directors of the Partnership, the general partner, GP LLC and their affiliates are generally eligible to receive awards under the 2017 2017 2017 Unit-Based Awards Unit-based awards under the 2017 In connection with the phantom unit awards, the CNG Committee also granted tandem DERs, which entitle the holders to receive distributions equal to the distributions paid on the Partnership’s common units between the date the units are granted and the settlement date. The DERs are payable in cash upon vesting but may During the year ended December 31, 2023, 2017 December 31, 2022 2021, December 31, 2023, 2022 2021 December 31, 2023, 2022 2021 December 31, 2023 December 31, 2022 A summary of the unit activity in the outstanding grants during 2023 (In thousands) Common Units Weighted Average Grant Date Fair value per Common Unit Outstanding grants at January 1, 2023 386 $ 28.96 Granted 281 $ 56.84 Fully vested and issued (184 ) $ 26.30 Outstanding at December 31, 2023 483 $ 46.21

Note 17 - Financing Transaction

Note 17 - Financing Transaction	12 Months Ended
Note 17 - Financing Transaction	Dec. 31, 2023
Notes to Financial Statements
Financing Receivables [Text Block]	17. Financing Transaction The Partnership owns rail loadout and associated infrastructure at the Sugar Camp mine in the Illinois Basin operated by a subsidiary of Foresight. The infrastructure at the Sugar Camp mine is leased to a subsidiary of Foresight and is accounted for as a financing transaction (the "Sugar Camp lease"). The Sugar Camp lease expires in 2032 $5.0 2021 second 2020 Note 14. 2032,

Note 18 - Credit Losses

Note 18 - Credit Losses	12 Months Ended
Note 18 - Credit Losses	Dec. 31, 2023
Notes to Financial Statements
Credit Loss, Financial Instrument [Text Block]	18. Credit Losses The Partnership is exposed to credit losses through the collection of its trade receivables resulting from contracts with customers and a long-term receivable resulting from a financing transaction with a customer. The Partnership records an allowance for current expected credit losses on these receivables based on the loss-rate method. NRP assessed the likelihood of collection of its receivables utilizing historical loss rates, current market conditions that included the estimated impact of the global COVID- 19 not As of December 31, 2023 2022 December 31, 2023 2022 (In thousands) Gross CECL Allowance Net Gross CECL Allowance Net Receivables $ 47,170 $ (5,655 ) $ 41,515 $ 47,237 $ (4,461 ) $ 42,776 Long-term contract receivable 27,265 (944 ) 26,321 29,984 (1,038 ) 28,946 Total $ 74,435 $ (6,599 ) $ 67,836 $ 77,221 $ (5,499 ) $ 71,722 NRP recorded $1.1 million, $1.1 million and $0.5 million in operating and maintenance expenses on its Consolidated Statements of Comprehensive Income related to the change in the CECL allowance during the year ended December 31, 2023, 2022 2021, NRP has procedures in place to monitor its ongoing credit exposure through timely review of counterparty balances against contract terms and due dates, account and financing receivable reconciliations, bankruptcy monitoring, lessee audits and dispute resolution. The Partnership may

Note 19 - Leases

Note 19 - Leases	12 Months Ended
Note 19 - Leases	Dec. 31, 2023
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	19. Leases As of December 31, 2023 two January 1, 2019, five five five December 31, 2023 2022 January 1, 2023, two five December 31, 2023, December 31, 2023 2022 December 31, 2023, 2022 2021 . The following table details the maturity analysis of the Partnership's operating lease liability and reconciles the undiscounted cash flows to the operating lease liability included on its Consolidated Balance Sheet: Remaining Annual Lease Payments (In thousands) December 31, 2023 2024 $ 541 2025 601 2026 604 2027 607 2028 611 After 2028 12,040 Total lease payments (1) $ 15,004 Less: present value adjustment (2) (10,683 ) Total operating lease liability $ 4,321 ( 1 The remaining lease terms of the Partnership's two 25 20.4 ( 2 The present value of the operating lease liability on the Partnership's Consolidated Balance Sheets was calculated using a 13.5% discount rate on the 30-year lease and a 13.4% discount rate on the 21.4 year lease. These rates represent the Partnership's estimated incremental borrowing rates under its two not

Insider Trading Arrangements

Insider Trading Arrangements	12 Months Ended
Insider Trading Arrangements	Dec. 31, 2023
Insider Trading Arr Line Items
Material Terms of Trading Arrangement [Text Block]	9B. During the fiscal quarter ended December 31, 2023, none 16a 1 10b5 1 10b5 1 408
Rule 10b5-1 Arrangement Adopted [Flag]	false
Non-Rule 10b5-1 Arrangement Adopted [Flag]	false
Rule 10b5-1 Arrangement Terminated [Flag]	false
Non-Rule 10b5-1 Arrangement Terminated [Flag]	false

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
Significant Accounting Policies (Policies)	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The accompanying Consolidated Financial Statements of the Partnership have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP"). The Consolidated Financial Statements include the accounts of Natural Resource Partners L.P. and its wholly owned subsidiaries. The Partnership has an equity investment in Sisecam Wyoming through which it is able to exercise significant influence over but does not not no
Use of Estimates, Policy [Policy Text Block]	Use of Estimates Preparation of the accompanying financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities on the accompanying Consolidated Balance Sheets, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses on the accompanying Consolidated Statements of Comprehensive Income during the reporting period. Actual results could differ from those estimates. The most significant estimates pertain to coal and aggregates mineral rights and related cash flow estimates which are used to compute depreciation, depletion and amortization and impairments of coal and aggregates properties and related intangible assets and commitments and contingencies.
Fair Value of Financial Instruments, Policy [Policy Text Block]	Fair Value The Partnership discloses certain assets and liabilities using fair value as defined by authoritative guidance. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. See Note 12. There are three may • Level 1—Quoted • Level 2—Observable 1 not • Level 3—Unobservable no 3
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash Equivalents The Partnership considers all highly liquid short-term investments with an original maturity of three
Receivable [Policy Text Block]	Allowance for Doubtful Accounts The Partnership records an allowance for doubtful accounts for its accounts receivable and notes receivable comprised of estimated credit risk and non-credit risk (e.g., legal disputes) losses. Receivables are written off when collection efforts are exhausted and future recovery is doubtful. The Partnership includes an allowance for current expected credit losses ("CECL") on its financial assets based on the loss-rate method. NRP assesses the likelihood of collection of its receivables utilizing historical loss rates, current market conditions, industry and macroeconomic factors, reasonable and supportable forecasts and facts or circumstances of individual customers and properties. See Note 18. million a December 31, 2023 2022 December 31, 2023 2022 million December 31, 2023 2022 million, December 31, 2023, 2022 2021
Land Coal and Mineral Rights Policy [Policy Text Block]	Mineral Rights Mineral rights owned and leased are recorded at its original cost of construction or, upon acquisition, at fair value of the assets acquired. Coal and aggregates mineral rights are depleted on a unit-of-production basis by lease, based upon minerals mined in relation to the net cost of the mineral properties and estimated economic tonnage therein.
Intangible Assets, Finite-Lived, Policy [Policy Text Block]	Intangible Assets The Partnership’s intangible assets consist of mineral royalty and transportation contracts that at acquisition were more favorable for the Partnership than prevailing market rates, known as above-market contracts. The estimated fair value of the above-market rate contracts are determined based on the present value of future cash flow projections related to the underlying assets acquired. Intangible assets are amortized on a unit-of-production basis by asset based upon minerals mined or transported in relation to the net book value of the intangible asset and estimated economic tonnage expected to be mined or transported during the above-market contract term.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Asset Impairment The Partnership has developed procedures to evaluate its long-lived assets, including intangible assets, for possible impairment periodically or whenever events or changes in circumstances indicate an asset's net book value may not not The Partnership evaluates its equity investment for impairment when events or changes in circumstances indicate, in management’s judgment, that the carrying value of such investment may 1 3 3
Accrued Liabilities [Policy Text Block]	Accrued Liabilities Included in accrued liabilities on the Partnership's Consolidated Balance Sheets at December 31, 2023 million of accrued employee costs and million of accrued property taxes. December 31, 2022
Revenue [Policy Text Block]	Revenue Recognition Mineral Rights Segment Revenues Royalty-based leases. two five three five The Partnership has defined its coal and aggregates royalty lease performance obligation as providing the lessee the right to mine and sell its coal or aggregates over the lease term. NRP then evaluated the likelihood that consideration it expected to receive from its lessees resulting from production would exceed consideration expected to be received from minimum payments over the lease term. As a result of this evaluation, revenue recognition from the Partnership's royalty-based leases is based on either production or minimum payments as follows: • Production Leases • Minimum Leases This evaluation is performed at the inception of the lease and only reassessed upon modification or renewal of the lease. Oil and gas related revenues consist of revenues from royalties and overriding royalties and are recognized on the basis of volume of hydrocarbons sold by lessees and the corresponding revenues from those sales. Also, included within oil and gas royalty revenues are lease bonus payments, which are generally paid upon the execution of a lease. The Partnership also has overriding royalty revenue interests in certain coal and aggregates mineral rights. Revenue from these interests is recognized over time based on when the coal is sold. Carbon neutral initiatives. Wheelage revenues. Other revenues. Transportation and processing services revenues. third Contract Modifications Contract modifications that impact goods or services or the transaction price are evaluated in accordance with ASC 606. not Contract Assets and Liabilities from Contracts with Customers Contract assets include receivables from contracts with customers and are recorded when the right to consideration becomes unconditional. Receivables are recognized when the minimums are contractually owed, production occurs or minimums accrued for based on the passage of time. Contract liabilities represent minimum consideration received, contractually owed or earned based on the passage of time. The current portion of deferred revenue relates to deferred revenue on minimum leases and lease amendment fees that are to be recognized as revenue on a straight-line basis over the next twelve twelve twelve
Equity Method Investments [Policy Text Block]	Equity in Earnings of Sisecam Wyoming The Partnership accounts for non-marketable equity investments using the equity method of accounting if the investment gives it the ability to exercise significant influence over, but not
Property Taxes Policy [Policy Text Block]	Property Taxes The Partnership is responsible for paying property taxes on the properties it owns. Typically, the lessees are contractually responsible for reimbursing the Partnership for property taxes on the leased properties. The payment of and reimbursement of property taxes is included in operating and maintenance expenses and in royalty and other mineral rights revenues, respectively, on the Consolidated Statements of Comprehensive Income.
Share-Based Payment Arrangement [Policy Text Block]	Unit-Based Compensation The Partnership has awarded unit-based compensation in the form of equity-based awards and phantom units. The Partnership's service and performance-based awards are valued using the closing price of NRP's units as of the grant date while the Partnership's market-based awards are valued using a Monte Carlo simulation. Compensation cost is remeasured each reporting period for liability-classified awards based on the fair value of an award and is recognized over the service period, which is generally the vesting period. Forfeitures are recognized as they occur. Unit-based compensation expense for all awards is recognized in general and administrative expenses and operating and maintenance expenses on the Consolidated Statements of Comprehensive Income. See Note 16.
Deferred Charges, Policy [Policy Text Block]	Deferred Financing Costs Deferred financing costs consist of legal and other costs related to the issuance of the Partnership’s debt. These costs are amortized over the term of the respective line-of-credit or debt arrangements. Deferred financing costs related to the Partnership's revolving credit facility are included in other long-term assets, net on the Partnership's Consolidated Balance Sheets. Deferred financing costs related to the Partnership's note agreements are included as a direct deduction from the carrying amount of the debt liability in current portion of long-term debt, net or long-term debt, net on the Partnership's Consolidated Balance Sheets.
Income Tax, Policy [Policy Text Block]	Income Taxes The Partnership is not may
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Standard On January 1, 2023, 2020 06, 470 20 815 40 2020 06 not Note 6. Net Income Per Common Unit Note 4. Class A Convertible Preferred Units and Warrants Recently Issued Accounting Standard In November 2023, ASU No. 2023 07 Segment Reporting (Topic 280 2023 07" 2023 07 December 15, 2023 not 2023 07

Note 3 - Revenues From Contra_2

Note 3 - Revenues From Contracts With Customers (Tables)	12 Months Ended
Note 3 - Revenues From Contracts With Customers (Tables)	Dec. 31, 2023
Notes Tables
Disaggregation of Revenue [Table Text Block]	For the Year Ended December 31, (In thousands) 2023 2022 2021 Coal royalty revenues $ 218,011 $ 226,956 $ 104,089 Production lease minimum revenues 3,322 5,854 14,269 Minimum lease straight-line revenues 19,389 18,792 20,564 Carbon neutral initiative revenues 2,969 8,600 13,790 Property tax revenues 6,219 5,878 6,028 Wheelage revenues 12,191 13,961 10,065 Coal overriding royalty revenues 2,175 3,434 4,367 Lease amendment revenues 3,070 3,201 4,696 Aggregates royalty revenues 2,876 3,299 1,889 Oil and gas royalty revenues 7,387 16,161 4,506 Other revenues 1,124 877 933 Royalty and other mineral rights revenues $ 278,733 $ 307,013 $ 185,196 Transportation and processing services revenues (1) 14,923 21,072 9,052 Total Mineral Rights segment revenues $ 293,656 $ 328,085 $ 194,248
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]	December 31, (In thousands) 2023 2022 Receivables Accounts receivable, net $ 37,206 $ 39,004 Other current assets, net (1) 429 — Other long-term assets, net (2) — 75 Contract liabilities Current portion of deferred revenue $ 4,599 $ 6,256 Deferred revenue 38,356 40,181 For the Year Ended December 31, (In thousands) 2023 2022 2021 Balance at beginning of period (current and non-current) $ 46,437 $ 61,862 $ 61,554 Increase due to minimums and lease amendment fees 17,526 19,073 19,842 Recognition of previously deferred revenue (21,008 ) (34,498 ) (19,534 ) Balance at end of period (current and non-current) $ 42,955 $ 46,437 $ 61,862
Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block]	Lease Term (1) Weighted Average Remaining Years Annual Minimum Payments 0 - 5 years 1.8 $ 17,477 5 - 10 years 6.1 18,655 10+ years 12.0 25,779 Total 7.4 $ 61,911

Note 4 - Class A Convertible _2

Note 4 - Class A Convertible Preferred Units and Warrants (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Preferred Units [Table Text Block]	Units Financial (In thousands, except unit data) Outstanding Position Balance at December 31, 2020 253,750 $ 168,337 Distribution paid-in-kind 15,571 15,571 Balance at December 31, 2021 269,321 $ 183,908 Redemption of preferred units paid-in-kind (19,321 ) (19,321 ) Balance at December 31, 2022 250,000 $ 164,587 Redemption of preferred units (178,334 ) (117,406 ) Balance at December 31, 2023 71,666 $ 47,181
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]	Warrants Financial (In thousands, except warrant data) Outstanding Position Balance at December 31, 2020 4,000,000 $ 66,816 Warrant settlement (997,500 ) (18,852 ) Balance at December 31, 2021 and 2022 3,002,500 $ 47,964 Warrant settlement (1,462,500 ) (24,869 ) Balance at December 31, 2023 1,540,000 $ 23,095

Note 5 - Common and Preferred_2

Note 5 - Common and Preferred Unit Distributions (Tables)	12 Months Ended
Note 5 - Common and Preferred Unit Distributions (Tables)	Dec. 31, 2023
Notes Tables
Distributions Made to Limited Partner, by Distribution [Table Text Block]	Cash Distributions Paid-in-kind Distributions Common Units Preferred Units Total Total Total Distribution Distribution (1) Distribution Distribution Distribution Date Paid Period Covered by Distribution per Unit (In thousands) per Unit (In thousands) (In units) 2023 February October 1 - December 31, 2022 $ 0.75 $ 9,571 $ 30.00 $ 7,500 — February (2) January 1 - February 8, 2023 — — 12.33 586 — March (3) Special Distribution 2.43 31,329 — — — May January 1 - March 31, 2023 0.75 9,669 30.00 6,075 — May (4) April 1 - May 5, 2023 — — 11.33 406 — June (5) April 1 - June 2, 2023 — — 20.33 915 — August April 1 - June 30, 2023 0.75 9,669 30.00 3,650 — August (6) June 30 - August 8, 2023 — — 12.33 432 — September (7) June 30 - September 12, 2023 — — 23.67 355 — November July 1 - September 30, 2023 0.75 9,670 30.00 2,150 — 2022 February October 1 - December 31, 2021 $ 0.45 $ 5,672 $ 30.00 $ 7,500 — February (8) January 1 - February 8, 2022 — — 13.35 258 — May January 1 - March 31, 2022 0.75 9,570 30.00 7,500 — August April 1 - June 30, 2022 0.75 9,571 30.00 7,500 — November July 1 - September 30, 2022 0.75 9,571 30.00 7,500 — 2021 February October 1 - December 31, 2020 $ 0.45 $ 5,630 $ 15.00 $ 3,806 3,806 May January 1 - March 31, 2021 0.45 5,672 15.00 3,864 3,864 August April 1 - June 30, 2021 0.45 5,671 15.00 3,921 3,921 November July 1 - September 30, 2021 0.45 5,672 15.00 3,980 3,980

Note 6 - Net Income Per Commo_2

Note 6 - Net Income Per Common Unit (Tables)	12 Months Ended
Note 6 - Net Income Per Common Unit (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	For the Year Ended December 31, (In thousands, except per unit data) 2023 2022 2021 Basic net income per common unit Net income attributable to common unitholders $ 196,771 $ 233,722 $ 75,747 Weighted average common units—basic 12,619 12,484 12,337 Basic net income per common unit $ 15.59 $ 18.72 $ 6.14 Diluted net income per common unit Weighted average common units—basic 12,619 12,484 12,337 Plus: dilutive effect of preferred units 2,059 6,176 9,604 Plus: dilutive effect of warrants 1,202 783 74 Plus: dilutive effect of unvested unit-based awards 216 210 178 Weighted average common units—diluted 16,096 19,653 22,193 Net income $ 278,435 $ 268,492 $ 108,902 Less: income attributable to preferred unitholders (2,694 ) — — Less: redemption of preferred units (60,929 ) — — Diluted net income attributable to common unitholders and the general partner $ 214,812 $ 268,492 $ 108,902 Less: diluted net income attributable to the general partner (4,296 ) (5,370 ) (2,178 ) Diluted net income attributable to common unitholders $ 210,516 $ 263,122 $ 106,724 Diluted net income per common unit $ 13.08 $ 13.39 $ 4.81

Note 7 - Segment Information (T

Note 7 - Segment Information (Tables)	12 Months Ended
Note 7 - Segment Information (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Operating Segments (In thousands) Mineral Rights Soda Ash Corporate and Financing Total For the Year Ended December 31, 2023 Revenues $ 293,656 $ 73,397 $ — $ 367,053 Gain on asset sales and disposals 2,956 — — 2,956 Operating and maintenance expenses 32,058 257 — 32,315 Depreciation, depletion and amortization 18,471 — 18 18,489 General and administrative expenses — — 26,111 26,111 Asset impairments 556 — — 556 Other expenses, net — — 14,103 14,103 Net income (loss) 245,527 73,140 (40,232 ) 278,435 As of December 31, 2023 Total assets $ 516,844 $ 276,549 $ 4,483 $ 797,876 For the Year Ended December 31, 2022 Revenues $ 328,085 $ 59,795 $ — $ 387,880 Gain on asset sales and disposals 1,082 — — 1,082 Operating and maintenance expenses 34,743 160 — 34,903 Depreciation, depletion and amortization 22,519 — — 22,519 General and administrative expenses — — 21,852 21,852 Asset impairments 4,457 — — 4,457 Other expenses, net — — 36,739 36,739 Net income (loss) 267,448 59,635 (58,591 ) 268,492 As of December 31, 2022 Total assets $ 566,615 $ 306,470 $ 4,046 $ 877,131 For the Year Ended December 31, 2021 Revenues $ 194,248 $ 21,871 $ — $ 216,119 Gain on asset sales and disposals 245 — — 245 Operating and maintenance expenses 26,880 169 — 27,049 Depreciation, depletion and amortization 19,075 — — 19,075 General and administrative expenses — — 17,360 17,360 Asset impairments 5,102 — — 5,102 Other expenses, net 24 — 38,852 38,876 Net income (loss) 143,412 21,702 (56,212 ) 108,902

Note 8 - Equity Investment (Tab

Note 8 - Equity Investment (Tables)	12 Months Ended
Note 8 - Equity Investment (Tables)	Dec. 31, 2023
Notes Tables
Equity Method Investments [Table Text Block]	For the Year Ended December 31, (In thousands) 2023 2022 2021 Balance at beginning of period $ 306,470 $ 276,004 $ 262,514 Income allocation to NRP’s equity interests (1) 78,179 64,712 26,979 Amortization of basis difference (4,783 ) (4,917 ) (5,108 ) Other comprehensive income (loss) (21,839 ) 15,506 2,889 Distributions (81,478 ) (44,835 ) (11,270 ) Balance at end of period $ 276,549 $ 306,470 $ 276,004 For the Year Ended December 31, (In thousands) 2023 2022 2021 Net sales $ 773,590 $ 720,120 $ 540,139 Gross profit 187,929 162,575 80,550 Net income 159,549 132,065 55,059 December 31, (In thousands) 2023 2022 Current assets $ 253,754 $ 340,437 Noncurrent assets 284,131 292,915 Current liabilities 91,853 111,258 Noncurrent liabilities 119,533 144,290

Note 9 - Mineral Rights, Net (T

Note 9 - Mineral Rights, Net (Tables)	12 Months Ended
Note 9 - Mineral Rights, Net (Tables)	Dec. 31, 2023
Notes Tables
Mineral Properties Disclosure [Table Text Block]	December 31, 2023 2022 (In thousands) Carrying Value Accumulated Depletion Net Book Value Carrying Value Accumulated Depletion Net Book Value Coal properties $ 661,256 $ (285,470 ) $ 375,786 $ 661,812 $ (269,037 ) $ 392,775 Aggregates properties 8,655 (3,761 ) 4,894 8,655 (3,410 ) 5,245 Oil and gas royalty properties 12,354 (10,082 ) 2,272 12,354 (9,600 ) 2,754 Other 13,143 (1,612 ) 11,531 13,150 (1,612 ) 11,538 Total mineral rights, net $ 695,408 $ (300,925 ) $ 394,483 $ 695,971 $ (283,659 ) $ 412,312
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]	For the Year Ended December 31, (In thousands) 2023 2022 2021 Coal properties (1) $ 556 $ 4,365 $ 5,015 Aggregates properties (2) — 92 87 Total $ 556 $ 4,457 $ 5,102

Note 10 - Intangible Assets, _2

Note 10 - Intangible Assets, Net (Tables)	12 Months Ended
Note 10 - Intangible Assets, Net (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Finite-Lived Intangible Assets [Table Text Block]	December 31, (In thousands) 2023 2022 Intangible assets at cost $ 51,353 $ 51,353 Less: accumulated amortization (37,671 ) (36,640 ) Total intangible assets, net $ 13,682 $ 14,713
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	(In thousands) Estimated Amortization Expense 2024 $ 884 2025 813 2026 753 2027 720 2028 480

Note 11 - Debt, Net (Tables)

Note 11 - Debt, Net (Tables)	12 Months Ended
Note 11 - Debt, Net (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Long-Term Debt Instruments [Table Text Block]	December 31, (In thousands) 2023 2022 Opco Credit Facility $ 95,834 $ 70,000 Opco Senior Notes 5.55 $ — $ 2,366 4.73 — 6,004 5.82 12,685 25,368 8.92 4,012 8,023 5.03 34,262 45,683 5.18 8,732 11,643 Total Opco Senior Notes $ 59,691 $ 99,087 Total debt at face value $ 155,525 $ 169,087 Net unamortized debt issuance costs (467 ) (806 ) Total debt, net $ 155,058 $ 168,281 Less: current portion of long-term debt (30,785 ) (39,076 ) Total long-term debt, net $ 124,273 $ 129,205
Schedule of Maturities of Long-Term Debt [Table Text Block]	(In thousands) Opco Senior Notes Opco Credit Facility Total 2024 $ 31,028 $ — $ 31,028 2025 14,332 — 14,332 2026 14,331 — 14,331 2027 — 95,834 95,834 2028 — — — Thereafter — — — $ 59,691 $ 95,834 $ 155,525

Note 12 - Fair Value Measurem_2

Note 12 - Fair Value Measurements (Tables)	12 Months Ended
Note 12 - Fair Value Measurements (Tables)	Dec. 31, 2023
Notes Tables
Fair Value Option, Disclosures [Table Text Block]	December 31, 2023 2022 Carrying Estimated Carrying Estimated (In thousands) Fair Value Hierarchy Level Value Fair Value Value Fair Value Debt: Opco Senior Notes (1) 3 $ 59,224 $ 56,533 $ 98,281 $ 96,060 Opco Credit Facility (2) 3 95,834 95,384 70,000 70,000 Assets: Contract receivable, net (current and long-term) (3) 3 $ 28,946 $ 24,492 $ 31,371 $ 24,833

Note 13 - Related Party Trans_2

Note 13 - Related Party Transactions (Tables)	12 Months Ended
Note 13 - Related Party Transactions (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Related Party Transactions [Table Text Block]	For the Year Ended December 31, (In thousands) 2023 2022 2021 Operating and maintenance expenses $ 6,747 $ 6,694 $ 6,543 General and administrative expenses 5,408 4,864 4,611

Note 14 - Major Customers (Tabl

Note 14 - Major Customers (Tables)	12 Months Ended
Note 14 - Major Customers (Tables)	Dec. 31, 2023
Notes Tables
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]	For the Year Ended December 31, 2023 2022 2021 (In thousands) Revenues Percent Revenues Percent Revenues Percent Alpha Metallurgical Resources, Inc. (1) $ 86,118 23 % $ 102,352 26 % $ 49,440 23 % Foresight (1) (2) 60,495 16 % 65,597 17 % 37,366 17 %

Note 16 - Unit-based Compensa_2

Note 16 - Unit-based Compensation (Tables)	12 Months Ended
Note 16 - Unit-based Compensation (Tables)	Dec. 31, 2023
Notes Tables
Share-Based Payment Arrangement, Activity [Table Text Block]	(In thousands) Common Units Weighted Average Grant Date Fair value per Common Unit Outstanding grants at January 1, 2023 386 $ 28.96 Granted 281 $ 56.84 Fully vested and issued (184 ) $ 26.30 Outstanding at December 31, 2023 483 $ 46.21

Note 18 - Credit Losses (Tables

Note 18 - Credit Losses (Tables)	12 Months Ended
Note 18 - Credit Losses (Tables)	Dec. 31, 2023
Notes Tables
Accounts Receivable, Allowance for Credit Loss [Table Text Block]	December 31, 2023 2022 (In thousands) Gross CECL Allowance Net Gross CECL Allowance Net Receivables $ 47,170 $ (5,655 ) $ 41,515 $ 47,237 $ (4,461 ) $ 42,776 Long-term contract receivable 27,265 (944 ) 26,321 29,984 (1,038 ) 28,946 Total $ 74,435 $ (6,599 ) $ 67,836 $ 77,221 $ (5,499 ) $ 71,722

Note 19 - Leases (Tables)

Note 19 - Leases (Tables)	12 Months Ended
Note 19 - Leases (Tables)	Dec. 31, 2023
Notes Tables
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]	Remaining Annual Lease Payments (In thousands) December 31, 2023 2024 $ 541 2025 601 2026 604 2027 607 2028 611 After 2028 12,040 Total lease payments (1) $ 15,004 Less: present value adjustment (2) (10,683 ) Total operating lease liability $ 4,321

Note 1 - Organization and Nat_2

Note 1 - Organization and Nature of Operations (Details Textual)	12 Months Ended
	Dec. 31, 2023
Number of Operating Segments	2
Number of Wholly Owned Operating Companies	1
Sisecam Wyoming [Member]
Equity Method Investment, Ownership Percentage	49%

Note 2 - Summary of Significa_2

Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss	$ 5,655	$ 4,461
Financing Receivable, Allowance for Credit Loss	900	1,000
Accounts Receivable, Credit Loss Expense (Reversal)	2,244	1,062	$ 2,572
Other Employee-related Liabilities, Current	10,300	9,500
Other Accrued Liabilities, Current	$ 2,700	2,400
Sisecam Wyoming LLC [Member]
Equity Method Investment, Ownership Percentage	49%
Minimum [Member]
Lessor, Operating Lease, Term of Contract (Year)	5 years
Operating Lease Late Payment Recovery Period (Year)	3 years
Maximum [Member]
Lessor, Operating Lease, Term of Contract (Year)	40 years
Operating Lease Late Payment Recovery Period (Year)	5 years
Accounts Receivable [Member]
Accounts Receivable, Allowance for Credit Loss	$ 5,400	4,500
Other Current Assets [Member]
Accounts Receivable, Allowance for Credit Loss	$ 300	$ 0

Note 3 - Revenues From Contra_3

Note 3 - Revenues From Contracts With Customers (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer, Excluding Assessed Tax	$ 278,733	$ 307,013	$ 185,196
Mineral Rights Segment [Member] \| Transportation and Processing Services [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	12,400	17,900	5,400
Sales-type Lease, Revenue	$ 2,500	$ 3,200	$ 3,600

Note 3 - Revenues From Contra_4

Note 3 - Revenues From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from contract with customers		$ 278,733	$ 307,013	$ 185,196
Mineral Rights Segment [Member] \| Operating Segments [Member]
Revenues		293,656	328,085	194,248
Coal Royalty Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers		218,011	226,956	104,089
Production Lease Minimum Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers		3,322	5,854	14,269
Minimum Lease Straight-line Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers		19,389	18,792	20,564
Carbon Neutral Initiatives [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers		2,969	8,600	13,790
Property Tax Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers		6,219	5,878	6,028
Wheelage Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers		12,191	13,961	10,065
Coal Overriding Royalty Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers		2,175	3,434	4,367
Lease Amendment Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers		3,070	3,201	4,696
Aggregates Royalty Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers		2,876	3,299	1,889
Oil and Gas Royalty Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers		7,387	16,161	4,506
Other Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers		1,124	877	933
Transportation and Processing Services [Member] \| Mineral Rights Segment [Member]
Revenues	[1]	$ 14,923	$ 21,072	$ 9,052

[1]Transportation and processing services revenues from contracts with customers as defined under ASC 606 was $12.4 million, $17.9 million and $5.4 million for the year ended December 31, 2023, 2022 and 2021, respectively. The remaining transportation and processing services revenues of $2.5 million, $3.2 million and $3.6 million for the year ended December 31, 2023, 2022 and 2021, respectively, related to other NRP-owned infrastructure leased to and operated by third-party operators accounted for under other guidance. See Note 17. Financing Transaction for more information.

Note 3 - Revenue From Contracts

Note 3 - Revenue From Contracts With Customers - Assets and Liabilities (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current portion of deferred revenue		$ 4,599	$ 6,256
Deferred revenue		38,356	40,181
Balance		46,437	61,862	$ 61,554
Increase due to minimums and lease amendment fees		17,526	19,073	19,842
Recognition of previously deferred revenue		(21,008)	(34,498)	(19,534)
Balance		42,955	46,437	$ 61,862
Coal Royalty Revenues [Member]
Current portion of deferred revenue		4,599	6,256
Deferred revenue		38,356	40,181
Coal Royalty Revenues [Member] \| Accounts Receivable [Member]
Contract with customer, current		37,206	39,004
Coal Royalty Revenues [Member] \| Other Current Assets [Member]
Contract with customer, current	[1]	429	0
Coal Royalty Revenues [Member] \| Other Noncurrent Assets [Member]
Contract with customer, noncurrent	[2]	$ 0	$ 75

[1]Other current assets, net includes short-term notes receivables from contracts with customers.[2]Other long-term assets, net includes long-term lease amendment fee receivables from contracts with customers.

Note 3 - Revenue From Contrac_2

Note 3 - Revenue From Contracts With Customers - Operating Lease Payments Receivable (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Weighted average remaining years (Year)	7 years 4 months 24 days
Annual minimum payments	$ 61,911	[1]
Lease Term, 0 to 5 Years [Member]
Weighted average remaining years (Year)	1 year 9 months 18 days
Annual minimum payments	$ 17,477	[1]
Lease Term, 5 to 10 Years [Member]
Weighted average remaining years (Year)	6 years 1 month 6 days
Annual minimum payments	$ 18,655	[1]
Lease Term, Greater Than 10 Years [Member]
Weighted average remaining years (Year)	12 years
Annual minimum payments	$ 25,779	[1]

[1]Lease term does not include renewal periods.

Note 4 - Class A Convertible _3

Note 4 - Class A Convertible Preferred Units and Warrants (Details Textual) $ / shares in Units, $ in Thousands							1 Months Ended					3 Months Ended	12 Months Ended
	Feb. 14, 2024 USD ($) $ / shares shares	Feb. 08, 2024 USD ($) $ / shares shares	Feb. 07, 2024 USD ($) $ / shares shares	Jan. 29, 2024 USD ($) $ / shares shares	Nov. 10, 2021 USD ($) $ / shares shares	Mar. 02, 2017 USD ($) $ / shares shares	Sep. 30, 2023 shares	Aug. 31, 2023 shares	Jun. 30, 2023 shares	May 31, 2023 shares	Feb. 28, 2023 shares	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Jan. 01, 2024 $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) shares
Temporary Equity, Par or Stated Value Per Share (in dollars per share) \| $ / shares													$ 1,000			$ 1,000
Preferred Units, Number of Redeemed Units (in shares)							(15,001)	(35,000)	(45,000)	(35,834)	(47,499)
Warrants and Rights Outstanding \| $													$ 23,095	$ 47,964		$ 47,964	$ 66,816
Class of Warrant or Right, Outstanding (in shares)													1,540,000	3,002,500		3,002,500	4,000,000
Warrants Exercised In Period (in shares)					997,500								1,462,500	997,500
Payment For Warrant Exercises \| $					$ 9,200
Volume Weighted Average Price of Share (in dollars per share) \| $ / shares					$ 32.02
Warrants at 22.81 Strike Price [Member]
Class of Warrant or Right Warrants, Issued (in shares)						1,750,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares					$ 22.81	$ 22.81
Warrants at 22.81 Strike Price [Member] \| Warrant Holder [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares													$ 22.81	$ 22.81		$ 22.81
Class of Warrant or Right, Repurchased and Retired (in shares)													752,500
Class of Warrant or Right, Outstanding (in shares)														752,500		752,500
Warrants at 34.00 Strike Price [Member]
Class of Warrant or Right Warrants, Issued (in shares)						2,250,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares						$ 34
Warrants at 34.00 Strike Price [Member] \| Warrant Holder [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares													$ 34	$ 34		$ 34
Class of Warrant or Right, Repurchased and Retired (in shares)													710,000
Warrants and Rights Outstanding \| $													$ 56,100
Class of Warrant or Right, Outstanding (in shares)													1,540,000			225,000
Warrants at 34.00 Strike Price [Member] \| Warrant Holder [Member] \| Subsequent Event [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares	$ 34	$ 34	$ 34	$ 34											$ 34
Class of Warrant or Right, Outstanding (in shares)															320,335
Volume Weighted Average Price of Share (in dollars per share) \| $ / shares	$ 93.47	$ 95.63	$ 96.29	$ 97.62
Class Of Warrants, Warrants Exercised (in shares)	500,000	128,750	128,750	462,165
Warrants and Rights Settled \| $	$ 29,700	$ 7,900	$ 8,000	$ 10,000
Class of Warrant or Right, Warrants Exercised, Issuance of Common Units (in shares)				198,767
Increase (Decrease) in Partners' Capital \| $												$ (18,300)
Warrants to Purchase Common Units [Member] \| Warrant Holders’ Interest [Member]
Warrants and Rights Outstanding \| $													$ 23,100			$ 48,000
Originally Issued Warrants [Member] \| Warrant Holder [Member] \| Subsequent Event [Member]
Class of Warrant or Right, Outstanding (in shares)															4,000,000
Class A Convertible Preferred Units [Member]
Preferred Units, Issued (in shares)						250,000
Temporary Equity, Par or Stated Value Per Share (in dollars per share) \| $ / shares						$ 1,000
Preferred Units Origination Fee Percent						2.50%
Preferred Stock, Dividend Rate, Percentage						12%
Convertible Preferred Units Maximum Redeemed Units Percent						33%
Convertible Preferred Units, Redemption Price, Minimum (in dollars per share) \| $ / shares						$ 51
Debt Instrument Covenants Consolidated Leverage Ratio Minimum						3.25
Debt Instrument Covenants Distributable Cash Flow Ratio Maximum						1.2
Partners' Capital, Distribution Amount Per Share (in dollars per share) \| $ / shares						$ 0.45
Preferred Units Preferred Purchaser Approval Rights Ownership Threshold						20%
Preferred Units, Number of Redeemed Units (in shares)													(83,333)
Preferred Units, Value of Redeemed Units \| $													$ 83,300
Preferred Units, Number of Repurchased Units (in shares)													(95,001)
Preferred Units, Value of Repurchased Units \| $													$ 95,000
Preferred Units, Outstanding (in shares)													71,666
Class A Convertible Preferred Units [Member] \| Debt Instrument, Redemption, Period One [Member]
Convertible Preferred Units Conversion to Common Units Discount Percentage						7.50%
Convertible Preferred Units Purchase Price Multiplier						1.5
Class A Convertible Preferred Units [Member] \| Debt Instrument, Redemption, Period Three [Member]
Convertible Preferred Units Conversion to Common Units Discount Percentage						10%
Convertible Preferred Units Purchase Price Multiplier						1.85
Class A Convertible Preferred Units [Member] \| Debt Instrument, Redemption, Period Two [Member]
Convertible Preferred Units Purchase Price Multiplier						1.7
Preferred Stock [Member]
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants, Total \| $						$ 250,000

Note 4 - Class A Convertible _4

Note 4 - Class A Convertible Preferred Units and Warrants - Preferred Units Activity (Details) - USD ($) $ in Thousands	1 Months Ended						12 Months Ended
	Sep. 30, 2023	Aug. 31, 2023	Jun. 30, 2023	May 31, 2023	Feb. 28, 2023	Feb. 28, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance, units outstanding (in shares)							250,000
Balance, financial position							$ 164,587
Preferred unit distributions paid-in-kind							$ 0	$ 0	$ 15,571
Redemption of preferred units paid-in-kind, units outstanding (in shares)						(19,321)
Redemption of preferred units (in shares)	(15,001)	(35,000)	(45,000)	(35,834)	(47,499)
Balance, units outstanding (in shares)							71,666	250,000
Balance, financial position							$ 47,181	$ 164,587
Preferred Partner [Member] \| Preferred Stock [Member]
Balance, units outstanding (in shares)							250,000	269,321	253,750
Balance, financial position							$ 164,587	$ 183,908	$ 168,337
Distribution paid-in-kind, units outstanding (in shares)									15,571
Preferred unit distributions paid-in-kind									$ 15,571
Redemption of preferred units paid-in-kind, units outstanding (in shares)								(19,321)
Redemption of preferred units paid-in-kind, financial position								$ (19,321)
Redemption of preferred units (in shares)							(178,334)
Redemption of preferred units							$ (117,406)
Balance, units outstanding (in shares)							71,666	250,000	269,321
Balance, financial position							$ 47,181	$ 164,587	$ 183,908

Note 4 - Class A Convertible _5

Note 4 - Class A Convertible Preferred Units and Warrants - Warrants Activity (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 10, 2021	Dec. 31, 2023	Dec. 31, 2021
Balance (in shares)		3,002,500	4,000,000
Balance		$ 47,964	$ 66,816
Warrant settlement (in shares)	(997,500)	(1,462,500)	(997,500)
Warrant settlement		$ (24,869)	$ (18,852)
Balance (in shares)		1,540,000	3,002,500
Balance		$ 23,095	$ 47,964

Note 5 - Common and Preferred_3

Note 5 - Common and Preferred Unit Distributions (Details Textual) - USD ($) $ in Thousands	1 Months Ended						9 Months Ended	12 Months Ended
	Sep. 30, 2023	Aug. 31, 2023	Jun. 30, 2023	May 31, 2023	Feb. 28, 2023	Feb. 28, 2022	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Allocated to Preferred Unit Holders								$ (16,719)	$ (30,000)	$ (31,609)
Preferred Stock Redemption Premium								60,929	0	0
Preferred Units, Number of Redeemed Units (in shares)	(15,001)	(35,000)	(45,000)	(35,834)	(47,499)
Distribution Made to Limited Partner, Unit Redemption (in shares)						(19,321)
Common Unitholders And General Partner [Member]
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Allocated to Preferred Unit Holders								$ 16,700	$ 30,000	$ 31,600
Partner, General [Member]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest							2%	2%

Note 5 - Common and Preferred_4

Note 5 - Common and Preferred Unit Distributions - Distributions Made to Partners (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended																		12 Months Ended
		Nov. 30, 2023	Sep. 30, 2023	[1]	Aug. 31, 2023	Jun. 30, 2023	[2]	May 31, 2023	Mar. 31, 2023	[3]	Feb. 28, 2023	Nov. 30, 2022	Aug. 31, 2022	May 31, 2022	Feb. 28, 2022	Nov. 30, 2021	Aug. 31, 2021	May 31, 2021	Feb. 28, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Distributions, common units																				$ 69,908	$ 34,384	$ 22,645
Preferred Partner [Member] \| Preferred Stock [Member]
Distribution per unit, common units (in dollars per share)		$ 30	$ 23.67		$ 30	$ 20.33		$ 30	$ 0		$ 30	$ 30	$ 30	$ 30	$ 30	$ 15	$ 15	$ 15	$ 15
Distribution, preferred stock		$ 2,150	$ 355		$ 3,650	$ 915		$ 6,075	$ 0		$ 7,500	$ 7,500	$ 7,500	$ 7,500	$ 7,500	$ 3,980	$ 3,921	$ 3,864	$ 3,806
Distributions, paid-in-kind		$ 0	$ 0		$ 0	$ 0		$ 0	$ 0		$ 0	$ 0	$ 0	$ 0	$ 0	$ 3,980	$ 3,921	$ 3,864	$ 3,806
Preferred Partner [Member] \| Preferred Stock [Member] \| Distributions Covering January 1 - February 8, 2023 [Member]
Distribution per unit, common units (in dollars per share)	[4]										$ 12.33
Distribution, preferred stock	[4]										$ 586
Distributions, paid-in-kind	[4]										$ 0
Preferred Partner [Member] \| Preferred Stock [Member] \| Distributions Covering April 1 - May 5, 2023 [Member]
Distribution per unit, common units (in dollars per share)	[5]							$ 11.33
Distribution, preferred stock	[5]							$ 406
Distributions, paid-in-kind	[5]							$ 0
Preferred Partner [Member] \| Preferred Stock [Member] \| Distributions Covering June 30 - August 8, 2023 [Member]
Distribution per unit, common units (in dollars per share)	[6]				$ 12.33
Distribution, preferred stock	[6]				$ 432
Distributions, paid-in-kind	[6]				$ 0
Preferred Partner [Member] \| Preferred Stock [Member] \| Distributions Covering January 1 - February 8, 2022 [Member]
Distribution per unit, common units (in dollars per share)	[7]														$ 13.35
Distribution, preferred stock	[7]														$ 258
Distributions, paid-in-kind	[7]														$ 0
Common Unitholders, General Partner [Member]
Distribution per unit, common units (in dollars per share)		$ 0.75	$ 0		$ 0.75	$ 0		$ 0.75	$ 2.43		$ 0.75	$ 0.75	$ 0.75	$ 0.75	$ 0.45	$ 0.45	$ 0.45	$ 0.45	$ 0.45
Distributions, common units	[8]	$ 9,670	$ 0		$ 9,669	$ 0		$ 9,669	$ 31,329		$ 9,571	$ 9,571	$ 9,571	$ 9,570	$ 5,672	$ 5,672	$ 5,671	$ 5,672	$ 5,630
Common Unitholders, General Partner [Member] \| Distributions Covering January 1 - February 8, 2023 [Member]
Distribution per unit, common units (in dollars per share)	[4]										$ 0
Distributions, common units	[4],[8]										$ 0
Common Unitholders, General Partner [Member] \| Distributions Covering April 1 - May 5, 2023 [Member]
Distribution per unit, common units (in dollars per share)	[5]							$ 0
Distributions, common units	[5],[8]							$ 0
Common Unitholders, General Partner [Member] \| Distributions Covering June 30 - August 8, 2023 [Member]
Distribution per unit, common units (in dollars per share)	[6]				$ 0
Distributions, common units	[6],[8]				$ 0
Common Unitholders, General Partner [Member] \| Distributions Covering January 1 - February 8, 2022 [Member]
Distribution per unit, common units (in dollars per share)	[7]														$ 0
Distributions, common units	[7],[8]														$ 0

[1]Relates to accrued distribution paid upon the redemption of 15,001 preferred units in September 2023.[2]Relates to accrued distribution paid upon the redemption of 45,000 preferred units in June 2023.[3]Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2022.[4]Relates to accrued distribution paid upon the redemption of 47,499 preferred units in February 2023.[5]Relates to accrued distribution paid upon the redemption of 35,834 preferred units in May 2023.[6]Relates to accrued distribution paid upon the redemption of 35,000 preferred units in August 2023.[7]Relates to accrued distribution paid upon the redemption of 19,321 preferred units paid-in-kind in February 2022.[8]Totals include the amount paid to NRP's general partner in accordance with the general partner's 2% general partner interest.

Note 6 - Net Income Per Commo_3

Note 6 - Net Income Per Common Unit (Details Textual) - $ / shares	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Nov. 10, 2021	Dec. 31, 2020	Mar. 02, 2017
Class of Warrant or Right, Outstanding (in shares)	1,540,000	3,002,500	3,002,500		4,000,000
Warrants at 34.00 Strike Price [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 34
Warrants at 22.81 Strike Price [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 22.81		$ 22.81
Warrant Holder [Member] \| Warrants at 34.00 Strike Price [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	1,540,000	2,250,000	2,250,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 34	$ 34	$ 34
Class of Warrant or Right, Outstanding (in shares)	1,540,000	225,000
Warrant Holder [Member] \| Warrants at 22.81 Strike Price [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 22.81	$ 22.81	$ 22.81
Class of Warrant or Right, Outstanding (in shares)		752,500	752,500

Note 6 - Net Income (Loss) Per

Note 6 - Net Income (Loss) Per Common Unit - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Net income attributable to common unitholders	$ 196,771		$ 233,722		$ 75,747
Weighted average common units—basic (in shares)	12,619		12,484		12,337
Basic net income per common unit (in dollars per share)	$ 15.59		$ 18.72		$ 6.14
Plus: dilutive effect of preferred units (in shares)	2,059		6,176		9,604
Plus: dilutive effect of warrants (in shares)	1,202		783		74
Plus: dilutive effect of unvested unit-based awards (in shares)	216		210		178
Weighted average common units—diluted (in shares)	16,096		19,653		22,193
Net income	$ 278,435	[1]	$ 268,492	[2]	$ 108,902	[3]
Less: income attributable to preferred unitholders	(2,694)		0		0
Less: redemption of preferred units	(60,929)		0		0
Diluted net income attributable to common unitholders and the general partner	214,812		268,492		108,902
Less: diluted net income attributable to the general partner	(4,296)		(5,370)		(2,178)
Diluted net income attributable to common unitholders	$ 210,516		$ 263,122		$ 106,724
Diluted net income per common unit (in dollars per share)	$ 13.08		$ 13.39		$ 4.81

[1]Net income includes $16.7 million of income attributable to preferred unitholders that accumulated during the period, of which $16.4 million is allocated to the common unitholders and $0.3 million is allocated to the general partner.[2]Net income includes $30.0 million of income attributable to preferred unitholders that accumulated during the period, of which $29.4 million is allocated to the common unitholders and $0.6 million is allocated to the general partner.[3]Net income includes $31.6 million of income attributable to preferred unitholders that accumulated during the period, of which $31.0 million is allocated to the common unitholders and $0.6 million is allocated to the general partner.

Note 7 - Segment Information (D

Note 7 - Segment Information (Details Textual)	12 Months Ended
Note 7 - Segment Information (Details Textual)	Dec. 31, 2023
Number of Operating Segments	2
Sisecam Wyoming [Member]
Equity Method Investment, Ownership Percentage	49%

Note 7 - Segment Information -

Note 7 - Segment Information - Information By Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues	$ 367,053	$ 387,880	$ 216,119
Gain on asset sales and disposals	2,956	1,082	245
Operating and maintenance expenses	32,315	34,903	27,049
Depreciation, depletion and amortization	18,489	22,519	19,075
General and administrative expenses	26,111	21,852	17,360
Asset impairments	556	4,457	5,102
Other expenses, net	14,103	36,739	38,876
Net income (loss)	278,435	268,492	108,902
Total assets	797,876	877,131
Corporate, Non-Segment [Member]
Revenues	0	0	0
Gain on asset sales and disposals	0	0	0
Operating and maintenance expenses	0	0	0
Depreciation, depletion and amortization	18	0	0
General and administrative expenses	26,111	21,852	17,360
Asset impairments	0	0	0
Other expenses, net	14,103	36,739	38,852
Net income (loss)	(40,232)	(58,591)	(56,212)
Total assets	4,483	4,046
Mineral Rights Segment [Member]
Depreciation, depletion and amortization	17,300	20,900	17,600
Mineral Rights Segment [Member] \| Operating Segments [Member]
Revenues	293,656	328,085	194,248
Gain on asset sales and disposals	2,956	1,082	245
Operating and maintenance expenses	32,058	34,743	26,880
Depreciation, depletion and amortization	18,471	22,519	19,075
General and administrative expenses	0	0	0
Asset impairments	556	4,457	5,102
Other expenses, net	0	0	24
Net income (loss)	245,527	267,448	143,412
Total assets	516,844	566,615
Soda Ash Segment [Member] \| Operating Segments [Member]
Revenues	73,397	59,795	21,871
Gain on asset sales and disposals	0	0	0
Operating and maintenance expenses	257	160	169
Depreciation, depletion and amortization	0	0	0
General and administrative expenses	0	0	0
Asset impairments	0	0	0
Other expenses, net	0	0	0
Net income (loss)	73,140	59,635	$ 21,702
Total assets	$ 276,549	$ 306,470

Note 8 - Equity Investment (Det

Note 8 - Equity Investment (Details Textual) - Sisecam Wyoming [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Equity Method Investment, Ownership Percentage	49%
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ (17,900)	$ (6,800)	$ 0
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	$ 116,600	$ 121,300
Weighted Average Useful Life of Equity Method Investment Difference Between Carrying Amount And Underlying Equity (Year)	27 years

Note 8 - Equity Investment - In

Note 8 - Equity Investment - Investment Activity (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Beginning Balance		$ 306,470
Ending Balance		276,549		$ 306,470
Net income		278,435	[1]	268,492	[2]	$ 108,902	[3]
Current assets		55,293		83,614
Current liabilities		49,840		60,229
Sisecam Wyoming [Member]
Net sales		773,590		720,120		540,139
Gross profit		187,929		162,575		80,550
Net income		159,549		132,065		55,059
Current assets		253,754		340,437
Noncurrent assets		284,131		292,915
Current liabilities		91,853		111,258
Noncurrent liabilities		119,533		144,290
Sisecam Wyoming [Member]
Beginning Balance		306,470		276,004		262,514
Income allocation to NRP’s equity interests (1)	[4]	78,179		64,712		26,979
Amortization of basis difference		(4,783)		(4,917)		(5,108)
Other comprehensive income (loss)		(21,839)		15,506		2,889
Distributions		(81,478)		(44,835)		(11,270)
Ending Balance		$ 276,549		$ 306,470		$ 276,004

[1]Net income includes $16.7 million of income attributable to preferred unitholders that accumulated during the period, of which $16.4 million is allocated to the common unitholders and $0.3 million is allocated to the general partner.[2]Net income includes $30.0 million of income attributable to preferred unitholders that accumulated during the period, of which $29.4 million is allocated to the common unitholders and $0.6 million is allocated to the general partner.[3]Net income includes $31.6 million of income attributable to preferred unitholders that accumulated during the period, of which $31.0 million is allocated to the common unitholders and $0.6 million is allocated to the general partner.[4]Amounts reclassified into income out of accumulated other comprehensive loss were $2.3 million and $(3.0) million for the three months ended June 30, 2023 and 2022, respectively, and $(18.3) million and $(4.7) million for the six months ended June 30, 2023 and 2022, respectively.

Note 9 - Mineral Rights, Net (D

Note 9 - Mineral Rights, Net (Details Textual) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Depreciation, Depletion and Amortization		$ 18,489	$ 22,519	$ 19,075
Asset Impairment Charges		$ 556	$ 4,457	5,102
Discount Rate		15%	15%
Coal Mineral Rights [Member]
Asset Impairment Charges	[1]	$ 556	$ 4,365	5,015
Coal Mineral Rights [Member] \| Other [Member]
Asset Impairment Charges			2,600
Property, Plant and Equipment, Net			4,300
Property, Plant, and Equipment, Fair Value Disclosure			$ 1,700
Discount Rate			15%
Aggregates Properties [Member]
Asset Impairment Charges	[2]	0	$ 92	87
Mineral Rights Segment [Member]
Depreciation, Depletion and Amortization		$ 17,300	$ 20,900	$ 17,600

[1]The Partnership recorded $0.6 million of impairment expense during the year ended December 31, 2023. The Partnership recorded $4.4 million of impairment expense during the year ended December 31, 2022 primarily related to assets whose undiscounted future net cash flows were less than their net book values. Of this amount, $2.6 million of impairment expense related to an asset with $4.3 million of net book value, resulting in a fair value of $1.7 million at December 31, 2022. The fair value of the impaired asset at December 31, 2022 was calculated using a discount rate of 15%. The Partnership recorded $5.0 million of impairment expense during the year ended December 31, 2021 primarily related to the full impairment of an asset resulting from a lease termination. NRP compared the net book value of its coal properties to estimated undiscounted future net cash flows. If the net book value exceeded the undiscounted future cash flows, the Partnership recorded an impairment for the excess of the net book value over fair value. A discounted cash flow model was used to estimate the level 3 fair value. Significant inputs used to determine fair value include estimates of future cash flows from coal sales and minimum payments, discount rate and useful economic life. Estimated cash flows are the product of a process that began with current realized pricing as of the measurement date and included an adjustment for risk related to the future realization of cash flows.[2]The Partnership recorded $0.1 million of aggregates royalty property impairments during the years ended December 31, 2022 and 2021. NRP compared the net book value of its aggregates properties to estimated undiscounted future net cash flows. If the net book value exceeded the undiscounted cash flows, the Partnership recorded an impairment for the excess of the net book value over fair value. A discounted cash flow model was used to estimate the level 3 fair value. Significant inputs used to determine fair value include estimates of future cash flows from aggregates sales and minimum payments, discount rate and useful economic life. Estimated cash flows are the product of a process that began with current realized pricing as of the measurement date and included an adjustment for risk related to the future realization of cash flows.

Note 9 - Mineral Rights, Net -

Note 9 - Mineral Rights, Net - Composition of Mineral Rights (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Mineral Properties, carrying value	$ 695,408	$ 695,971
Mineral Properties, accumulated depletion	(300,925)	(283,659)
Mineral Properties, net book value	394,483	412,312
Coal Properties [Member]
Mineral Properties, carrying value	661,256	661,812
Mineral Properties, accumulated depletion	(285,470)	(269,037)
Mineral Properties, net book value	375,786	392,775
Aggregates Properties [Member]
Mineral Properties, carrying value	8,655	8,655
Mineral Properties, accumulated depletion	(3,761)	(3,410)
Mineral Properties, net book value	4,894	5,245
Oil and Gas Royalty Properties [Member]
Mineral Properties, carrying value	12,354	12,354
Mineral Properties, accumulated depletion	(10,082)	(9,600)
Mineral Properties, net book value	2,272	2,754
Other [Member]
Mineral Properties, carrying value	13,143	13,150
Mineral Properties, accumulated depletion	(1,612)	(1,612)
Mineral Properties, net book value	$ 11,531	$ 11,538

Note 9 - Mineral Rights, Net _2

Note 9 - Mineral Rights, Net - Impairment of Mineral Rights (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Asset Impairment Charges		$ 556	$ 4,457	$ 5,102
Coal Mineral Rights [Member]
Asset Impairment Charges	[1]	556	4,365	5,015
Aggregates Properties [Member]
Asset Impairment Charges	[2]	0	92	87
Mining Properties and Mineral Rights [Member]
Asset Impairment Charges		$ 556	$ 4,457	$ 5,102

[1]The Partnership recorded $0.6 million of impairment expense during the year ended December 31, 2023. The Partnership recorded $4.4 million of impairment expense during the year ended December 31, 2022 primarily related to assets whose undiscounted future net cash flows were less than their net book values. Of this amount, $2.6 million of impairment expense related to an asset with $4.3 million of net book value, resulting in a fair value of $1.7 million at December 31, 2022. The fair value of the impaired asset at December 31, 2022 was calculated using a discount rate of 15%. The Partnership recorded $5.0 million of impairment expense during the year ended December 31, 2021 primarily related to the full impairment of an asset resulting from a lease termination. NRP compared the net book value of its coal properties to estimated undiscounted future net cash flows. If the net book value exceeded the undiscounted future cash flows, the Partnership recorded an impairment for the excess of the net book value over fair value. A discounted cash flow model was used to estimate the level 3 fair value. Significant inputs used to determine fair value include estimates of future cash flows from coal sales and minimum payments, discount rate and useful economic life. Estimated cash flows are the product of a process that began with current realized pricing as of the measurement date and included an adjustment for risk related to the future realization of cash flows.[2]The Partnership recorded $0.1 million of aggregates royalty property impairments during the years ended December 31, 2022 and 2021. NRP compared the net book value of its aggregates properties to estimated undiscounted future net cash flows. If the net book value exceeded the undiscounted cash flows, the Partnership recorded an impairment for the excess of the net book value over fair value. A discounted cash flow model was used to estimate the level 3 fair value. Significant inputs used to determine fair value include estimates of future cash flows from aggregates sales and minimum payments, discount rate and useful economic life. Estimated cash flows are the product of a process that began with current realized pricing as of the measurement date and included an adjustment for risk related to the future realization of cash flows.

Note 10 - Intangible Assets, _3

Note 10 - Intangible Assets, Net (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amortization of Intangible Assets	$ 1	$ 1.4	$ 1.3

Note 10 - Intangible Asset, Net

Note 10 - Intangible Asset, Net - Schedule of Finite-Lived Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Intangible assets at cost	$ 51,353	$ 51,353
Less: accumulated amortization	(37,671)	(36,640)
Total intangible assets, net	$ 13,682	$ 14,713

Note 10 - Intangible Assets, _4

Note 10 - Intangible Assets, Net - Schedule of Finite-Lived Assets Future Amortization Expense (Details) $ in Thousands	Dec. 31, 2023 USD ($)
2024	$ 884
2025	813
2026	753
2027	720
2028	$ 480

Note 11 - Debt, Net (Details Te

Note 11 - Debt, Net (Details Textual) $ in Thousands		1 Months Ended	12 Months Ended
Note 11 - Debt, Net (Details Textual) $ in Thousands	Feb. 01, 2024 USD ($)	Feb. 29, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 31, 2024 USD ($)	May 31, 2023 USD ($)	Aug. 31, 2022 USD ($)
Repayments of Long-Term Debt, Total			$ 262,396	$ 339,396	$ 39,396
Nontrade Receivables, Noncurrent			26,321	28,946
Long-Term Debt, Gross			$ 155,525	169,087
Ciner Wyoming LLC [Member]
Equity Method Investment, Ownership Percentage			49%
Opco [Member]
Percentage Of Consolidated Net Tangible Assets Debt Of Subsidiaries Not Permitted To Exceed			10%
Opco [Member] \| Minimum [Member]
Ratio of EBITDA To Consolidated Fixed Charges			3.5
Opco [Member] \| Maximum [Member]
Ratio of Indebtedness to Net Capital			4
Senior Notes [Member] \| Opco [Member]
Debt Instrument Asset Sales Proceeds Required to Repay Outstanding Debt Percent			25%
Long-Term Debt, Gross			$ 59,700	99,100
Repayments of Debt			$ 39,400
Senior Notes [Member] \| Nine Point One Two Five Percent Senior Notes Due June Two Zero Two Five [Member]
Repayments of Long-Term Debt, Total				300,000
Redemption Premium				7,200
Write off of Deferred Debt Issuance Cost				3,100
Debt Instrument, Interest Rate, Stated Percentage			9.125%
Debt Instrument, Redemption Price At Change of Control Event As Percentage of Principal Amount			101%
Senior Notes [Member] \| Nine Point One Two Five Percent Senior Notes Due June Two Zero Two Five [Member] \| Debt Instrument, Redemption, Period Two [Member]
Debt Instrument, Redemption Price, Percentage			104.563%
Senior Notes [Member] \| Nine Point One Two Five Percent Senior Notes Due June Two Zero Two Five [Member] \| Debt Instrument, Redemption, Period Three [Member]
Debt Instrument, Redemption Price, Percentage			102.281%
Senior Notes [Member] \| Nine Point One Two Five Percent Senior Notes Due June Two Zero Two Five [Member] \| Debt Instrument, Redemption, Period Four [Member]
Debt Instrument, Redemption Price, Percentage			100%
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Opco [Member]
Line of Credit Facility, Remaining Borrowing Capacity			$ 59,200	60,000			$ 155,000	$ 130,000
Line of Credit Facility, Maximum Borrowing Capacity, Addition of Future Commitments							$ 200,000
Long-Term Line of Credit			95,800	$ 70,000
Proceeds from Lines of Credit			248,800
Repayments of Lines of Credit			$ 223,000
Long-Term Debt, Weighted Average Interest Rate, over Time			8.70%	7.17%
Line of Credit Facility, Commitment Fee Percentage			0.50%
Debt Instrument, Covenant, Maximum Leverage Ratio, Quarterly Distribution Above Threshold			3
Ratio of EBITDA To Consolidated Fixed Charges			3.5
Debt Instrument Asset Sales Proceeds Required to Repay Outstanding Debt Percent			75%
Nontrade Receivables, Noncurrent			$ 26,300	$ 28,900
Long-Term Debt, Gross			95,834	70,000
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Opco [Member] \| Subsequent Event [Member]
Line of Credit Facility, Increase (Decrease), Net	$ 30,000	$ 15,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 185,000	200,000				$ 155,000
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Opco [Member] \| Subsequent Event [Member] \| New Lender [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 30,000
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Opco [Member] \| Other Noncurrent Assets [Member]
Debt Instrument, Collateral Amount			$ 316,300	$ 326,400
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Opco [Member] \| Federal Funds Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			0.50%
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Opco [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			1%
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Revolving Credit Facility Basis Spread Condition One [Member] \| Opco [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate			2.50%
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Revolving Credit Facility Basis Spread Condition One [Member] \| Opco [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate			3.50%
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Revolving Credit Facility Basis Spread Condition Two [Member] \| Opco [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate			3.50%
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Revolving Credit Facility Basis Spread Condition Two [Member] \| Opco [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate			4.50%
The Eight Point Nine Two Senior Notes Due March Two Zero Two Four [Member] \| Opco [Member]
Debt Instrument, Interest Rate, Stated Percentage			8.92%
Partnership Leverage Ratio, Maximum			3.75
Debt Instrument, Additional Variable Interest Rate			2%

Note 11 - Debt, Net - Schedule

Note 11 - Debt, Net - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt instrument, carrying value	$ 155,525	$ 169,087
Net unamortized debt issuance costs	(467)	(806)
Total debt, net	155,058	168,281
Less: current portion of long-term debt	(30,785)	(39,076)
Total long-term debt, net	124,273	129,205
Senior Notes [Member] \| Five Point Five Five Percent Senior Note Due June Two Zero Two Three [Member]
Debt instrument, carrying value	0	2,366
Senior Notes [Member] \| Four Point Seven Three Percent Senior Note Due December Two Zero Two Three [Member]
Debt instrument, carrying value	0	6,004
Senior Notes [Member] \| Five Point Eight Two Percent Senior Note Due March Two Zero Two Four [Member]
Debt instrument, carrying value	12,685	25,368
Senior Notes [Member] \| Eight Point Nine Two Percent Senior Note Due March Two Zero Two Four [Member]
Debt instrument, carrying value	4,012	8,023
Senior Notes [Member] \| Five Point Zero Three Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, carrying value	34,262	45,683
Senior Notes [Member] \| Five Point One Eight Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, carrying value	8,732	11,643
Opco Senior Notes [Member]
Debt instrument, carrying value	59,691	99,087
Opco [Member] \| Floating Rate Revolving Credit Facility Due August 2027 [Member]
Debt instrument, carrying value	95,834	70,000
Opco [Member] \| Senior Notes [Member]
Debt instrument, carrying value	$ 59,700	$ 99,100

Note 11 - Debt, Net - Schedul_2

Note 11 - Debt, Net - Schedule of Long-term Debt (Details) (Parentheticals) - Senior Notes [Member]	Dec. 31, 2023	Dec. 31, 2022
Five Point Five Five Percent Senior Note Due June Two Zero Two Three [Member]
Debt instrument, interest rate	5.55%	5.55%
Four Point Seven Three Percent Senior Note Due December Two Zero Two Three [Member]
Debt instrument, interest rate	4.73%	4.73%
Five Point Eight Two Percent Senior Note Due March Two Zero Two Four [Member]
Debt instrument, interest rate	5.82%	5.82%
Eight Point Nine Two Percent Senior Note Due March Two Zero Two Four [Member]
Debt instrument, interest rate	8.92%	8.92%
Five Point Zero Three Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, interest rate	5.03%	5.03%
Five Point One Eight Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, interest rate	5.18%	5.18%

Note 11 - Debt, Net - Schedul_3

Note 11 - Debt, Net - Schedule of Principle Payments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
2024	$ 31,028
2025	14,332
2026	14,331
2027	95,834
2028	0
Thereafter	0
Long Term Debt Maturities Repayments Of Principle	155,525
Senior Notes [Member] \| Opco [Member]
2024	31,028
2025	14,332
2026	14,331
2027	0
2028	0
Thereafter	0
Long Term Debt Maturities Repayments Of Principle	59,691
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Opco [Member]
2024	0
2025	0
2026	0
2027	95,834
2028	0
Thereafter	0
Long Term Debt Maturities Repayments Of Principle	$ 95,834

Note 12 - Fair Value Measurem_3

Note 12 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Discount Rate	15%	15%
Embedded Derivative, Fair Value of Embedded Derivative Liability	$ 0	$ 0

Note 12 - Fair Value Measurem_4

Note 12 - Fair Value Measurements - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Reported Value Measurement [Member]
Contract receivable, net (current and long-term)	[1]	$ 28,946	$ 31,371
Estimate of Fair Value Measurement [Member]
Contract receivable, net (current and long-term)	[1]	24,492	24,833
Opco Senior Notes [Member] \| Reported Value Measurement [Member]
Long term debt, fair value	[2]	59,224	98,281
Opco Senior Notes [Member] \| Estimate of Fair Value Measurement [Member]
Long term debt, fair value	[2]	56,533	96,060
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Reported Value Measurement [Member]
Long term debt, fair value	[3]	95,834	70,000
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Estimate of Fair Value Measurement [Member]
Long term debt, fair value	[3]	$ 95,384	$ 70,000

[1]The fair value of the Partnership's contract receivable was determined based on the present value of future cash flow projections related to the underlying asset at a discount rate of 15% at December 31, 2023 and 2022.[2]The fair value of the Opco Senior Notes was estimated by management utilizing the present value replacement method incorporating the interest rate of the Opco Credit Facility.[3]The fair value of the Opco Credit Facility approximates the outstanding borrowing amount because the interest rates are variable and reflective of market rates and the terms of the credit facility allow the Partnership to repay this debt at any time without penalty.

Note 13 - Related Party Trans_3

Note 13 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Payable, Current	$ 885	$ 1,992
Operating Costs and Expenses	32,315	34,903	$ 27,049
Other Noncurrent Liabilities [Member]
Operating Lease, Right-of-Use Asset	4,300	3,500
Operating Lease, Liability	4,321	3,500
WPPLP [Member] \| Other Long Term Assets [Member]
Operating Lease, Right-of-Use Asset	3,500	3,500
WPPLP [Member] \| Other Noncurrent Liabilities [Member]
Operating Lease, Liability	3,500	3,500
Quintana Minerals Corp [Member] \| Affiliated Entity [Member]
Accounts Payable, Current	400	400
Western Pocahontas Properties Limited Partnership [Member] \| Affiliated Entity [Member]
Accounts Payable, Current	200	1,000
Operating Costs and Expenses	$ 5,100	$ 8,500	$ 3,300

Note 13 - Related Party Trans_4

Note 13 - Related Party Transactions - General Partner Affiliates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Costs and Expenses	$ 32,315	$ 34,903	$ 27,049
QMC and WPPLP and QID [Member] \| Affiliated Entity [Member]
Operating Costs and Expenses	6,747	6,694	6,543
General and administrative expenses	$ 5,408	$ 4,864	$ 4,611

Note 14 - Major Customers - Con

Note 14 - Major Customers - Concentration Risk (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Alpha Metallurgical Resources [Member]
Net sales	[1]	$ 86,118	$ 102,352	$ 49,440
Alpha Metallurgical Resources [Member] \| Revenue Benchmark [Member] \| Customer Concentration Risk [Member]
Revenue, percent (1)	[1],[2]	23%	26%	23%
Foresight Energy Resources [Member]
Net sales		$ 60,495	$ 65,597	$ 37,366
Foresight Energy Resources [Member] \| Revenue Benchmark [Member] \| Customer Concentration Risk [Member]
Revenue, percent (1)		16%	17%	17%

[1]Revenues from Alpha Metallurgical Resources, Inc. and Foresight are included within the Partnership's Mineral Rights segment.[2]Revenues from Foresight in 2021 were fixed as a result of the lease amendment the Partnership entered into with Foresight pursuant to which Foresight agreed to pay NRP fixed cash payments to satisfy all obligations arising out of the existing various coal mining leases and transportation infrastructure fee agreements between the Partnership and Foresight. Revenues from Foresight in 2022 and 2023 represent traditional royalty and minimum payments.

Note 16 - Unit-based Compensa_3

Note 16 - Unit-based Compensation (Details Textual) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2017
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)		1,600,000			800,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)	800,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)		10 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		3 years
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 13.3	$ 6.3
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		1 year 10 months 24 days
General and Administrative Expenses and Operating and Maintenance Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value		$ 16	7.9	$ 3.8
Share-Based Payment Arrangement, Expense		10.9	$ 5.8	$ 4
General and Administrative Expenses and Operating and Maintenance Expense [Member] \| Market-based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value		$ 2.8
Director [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		1 year

Note 16 - Unit-Based Compensa_4

Note 16 - Unit-Based Compensation - Share-based Compensation Activity (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Outstanding (in shares) \| shares	386
Outstanding (in dollars per share) \| $ / shares	$ 28.96
Granted (in shares) \| shares	281
Granted (in dollars per share) \| $ / shares	$ 56.84
Fully vested and issued (in shares) \| shares	(184)
Fully vested and issued (in dollars per share) \| $ / shares	$ 26.3
Outstanding (in shares) \| shares	483
Outstanding (in dollars per share) \| $ / shares	$ 46.21

Note 17 - Financing Transacti_2

Note 17 - Financing Transaction (Details Textual) - Sugar Camp Mine [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2032	Dec. 31, 2023
Lessor, Operating Lease, Renewal Term (Year)		80 years
Proceeds from Annual Minimum Lease Payments		$ 5,000
Forecast [Member]
Operating Lease, Lease Income	$ 10

Note 18 - Credit Losses (Detail

Note 18 - Credit Losses (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Loss, Expense (Reversal)	$ 1.1	$ 1.1	$ 0.5

Note 18 - Credit Losses - Allow

Note 18 - Credit Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Receivables, gross	$ 47,170	$ 47,237
Receivables, allowance	(5,655)	(4,461)
Receivables, net	41,515	42,776
Long-term contract receivable, gross	27,265	29,984
Long-term contract receivable, allowance	(944)	(1,038)
Long-term contract receivable, net	26,321	28,946
Total, gross	74,435	77,221
Total, allowance	(6,599)	(5,499)
Total, net	$ 67,836	$ 71,722

Note 19 - Leases (Details Textu

Note 19 - Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Note 19 - Leases (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Lease, Expense	$ 600	$ 500	$ 500
Other Noncurrent Liabilities [Member]
Operating Lease, Right-of-Use Asset	4,300	3,500
Operating Lease, Liability	$ 4,321	$ 3,500
The 30 Year Lease [Member]
Lessee, Operating Lease, Term of Contract (Year)	30 years
Lessee Operating Lease The Option to Extend (Year)	5 years
Lessee, Operating Lease, Renewal Term (Year)	5 years
Lessee, Operating Lease, Discount Rate	13.50%
The 30 Year Lease [Member] \| Minimum [Member]
Lessee, Operating Lease, Term of Contract (Year)	5 years
The 30 Year Lease [Member] \| Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)	30 years
The 21.4 Year Lease [Member]
Lessee, Operating Lease, Term of Contract (Year)	21 years 4 months 24 days
Lessee Operating Lease The Option to Extend (Year)	2 years
Lessee, Operating Lease, Renewal Term (Year)	5 years
Lessee, Operating Lease, Discount Rate	13.40%
The 21.4 Year Lease [Member] \| Minimum [Member]
Lessee, Operating Lease, Term of Contract (Year)	11 years 4 months 24 days
The 21.4 Year Lease [Member] \| Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)	21 years 4 months 24 days

Note 19 - Lease - Schedule of L

Note 19 - Lease - Schedule of Lease Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
2024	$ 541
2025	601
2026	604
2027	607
2028	611
After 2028	12,040
Total lease payments (1)	15,004
Less: present value adjustment (2)	(10,683)
Other Noncurrent Liabilities [Member]
Total operating lease liability	$ 4,321	$ 3,500