Note 9 - Stockholders' Equity (Details Textual) | | | | | | | | | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | | | | | | | | |
Jan. 02, 2025 shares | Aug. 14, 2024 USD ($) $ / shares | Mar. 04, 2024 USD ($) $ / shares shares | Jan. 09, 2024 $ / shares shares | Jan. 03, 2024 shares | Jan. 02, 2024 shares | Mar. 27, 2023 USD ($) | Mar. 23, 2023 USD ($) $ / shares shares | Jul. 31, 2024 USD ($) shares | Jun. 30, 2024 USD ($) shares | Feb. 13, 2024 USD ($) shares | Aug. 14, 2023 shares | Sep. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2024 USD ($) shares | Sep. 30, 2023 USD ($) | Jun. 30, 2023 shares | Jun. 30, 2024 USD ($) shares | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) | Jun. 29, 2024 USD ($) | Jun. 20, 2024 $ / shares | Jun. 19, 2024 $ / shares | Apr. 22, 2024 shares | Apr. 21, 2024 shares | Dec. 31, 2023 USD ($) $ / shares shares | Jul. 25, 2023 USD ($) $ / shares shares | Jan. 18, 2023 USD ($) $ / shares shares |
Common Stock, Shares Authorized (in shares) | shares | | | | | | | | | | | | | | 300,000,000 | | | | | | 300,000,000 | | | | | | 300,000,000 | 100,000,000 | 300,000,000 | | |
Preferred Stock, Shares Authorized (in shares) | shares | | | | | | | | | | | | | | 2,000,000 | | | | | | 2,000,000 | | | | | | 2,000,000 | | 2,000,000 | | |
Proceeds from Issuance of Common Stock | | | | | | | | | | | | | | | | | | | | $ 0 | | $ 9,159,000 | | | | | | | | |
Proceeds from Convertible Debt | | | | | | | | | | | | | | | | | | | | $ 14,100,000 | | 0 | | | | | | | | |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | | | | $ 0.0001 | | | | | | | | | | $ 0.0001 | | | | | | $ 0.0001 | | | | | | | | $ 0.0001 | | $ 0.0001 |
Debt Conversion, Original Debt, Amount | | | | | | | | | | | | | | | | | | | | $ 1,875,000 | | | | | | | | | | |
Convertible Debt, Current | | | | | | | | | | | | | | $ 11,621,000 | | | | | | 11,621,000 | | | | | | | | $ 0 | | |
Gain (Loss) on Extinguishment of Debt | | | | | | | | | | | | | | $ 0 | | | $ 0 | | | $ (4,693,000) | | 527,000 | | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | | | | | | | | | | | | | $ 2.32 | | | | | | $ 2.32 | | | | | | | | | | |
Class of Warrant or Right, Exercised in Period (in shares) | shares | | | | | | | | | | | | | | | | | | | | 3,675,000 | | | | | | | | | | |
Warrants and Rights Outstanding | | | | | | | | | | | | | | $ 0 | | | | | | $ 0 | | | | | | | | | | |
The Wainwright [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Non-accountable Expenses | | | | | | | | | $ 75,000 | | | | | | | | | | | | | | | | | | | | | |
Clearing Fees | | | | | | | | | $ 16,000 | | | | | | | | | | | | | | | | | | | | | |
Prefunded Warrants [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | | | | | | | | | 772,853 | | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Price Per Share or Warrant (in shares) | shares | | | | | | | | | 1.455 | | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | | | | | | | | $ 0.001 | | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Exercised in Period (in shares) | shares | | | | | | | | | | | | | | | | | | 772,853 | | | | | | | | | | | | |
Stock Issued During Period, Shares, Warrants Exercised (in shares) | shares | | | | | | | | | | | | | | | | | | 772,853 | | | | | | | | | | | | |
Proceeds from Warrant Exercises | | | | | | | | | | | | | | | | | | | | $ 0 | | 1,000 | | | | | | | | |
The Common Warrants [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | | | | | | | | | 6,872,853 | | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Price Per Share or Warrant (in shares) | shares | | | | | | | | | 1.454 | | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | | | | | | | | $ 1.6 | | | | | | | | | | | | | | | | | | | | | |
Warrants and Rights Outstanding, Term (Year) | | | | | | | | | 5 years | | | | | | | | | | | | | | | | | | | | | |
The Placement Agent Warrants [Member] | The Wainwright [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | | | | | | | | | 481,100 | | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | | | | | | | | $ 1.8188 | | | | | | | | | | | | | | | | | | | | | |
Warrants and Rights Outstanding, Term (Year) | | | | | | | | | 5 years | | | | | | | | | | | | | | | | | | | | | |
The 2023 Registered Direct Offering Warrants [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | | | | | | | | | | | | | $ 1.82 | [1] | | | | | $ 1.82 | [1] | | | | | | | | $ 1.6 | |
Class of Warrant or Right, Exercised in Period (in shares) | shares | | | | | | | | | | | | | 6,872,853 | | | | | | | 0 | [1] | | | | | | | | | |
Warrants and Rights Outstanding | [1] | | | | | | | | | | | | | $ 0 | | | | | | $ 0 | | | | | | | | | | |
Proceeds from Warrant Exercises | | | | | | | | | | | | | | | | | | | | $ 0 | | 10,996,000 | | | | | | | | |
The 2023 Private Warrants [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 2,850,000 | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | | | | | | | | | | | | | $ 3.25 | [2] | | | | | $ 3.25 | [2] | | | | | | | | $ 3.25 | |
Warrants and Rights Outstanding, Term (Year) | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 5 years | |
Class of Warrant or Right, Exercised in Period (in shares) | shares | [2] | | | | | | | | | | | | | | | | | | | 0 | | | | | | | | | | |
Warrants and Rights Outstanding | | | | | | | | | | | | | | $ 0 | [2] | | | | | $ 0 | [2] | | | | | | | | $ 6,757,000 | |
The 2023 Private Warrants [Member] | Measurement Input, Expected Term [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 5 | |
The 2023 Private Warrants [Member] | Measurement Input, Price Volatility [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1.15 | |
The 2023 Private Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 0.0415 | |
The 2023 Private Warrants [Member] | Measurement Input, Share Price [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 2.85 | |
Warrants Issued With 2023 Promissory Notes [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 6,250,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | | | | | | | | | | | | | $ 1.58 | [3] | | | | | $ 1.58 | [3] | | | | | | | | | $ 2 |
Warrants and Rights Outstanding, Term (Year) | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 5 years |
Class of Warrant or Right, Exercised in Period (in shares) | shares | [3] | | | | | | | | | | | | | | | | | | | 3,675,000 | | | | | | | | | | |
Warrants and Rights Outstanding | | | | | | | | | | | | | | $ 0 | [3] | | | | | $ 0 | [3] | | | | | | | | | $ 5,125,000 |
Increase (Decrease) in Number of Warrants Held (in shares) | shares | | | | | | | | | | | | | | | | | | | (1,575,000) | | | | | | | | | | | |
The 2023 Warrants [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 6,250,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | | | | | | | | | | | | | | | | | | | | | | | $ 1.4 | $ 2 | | | | | $ 2 |
Stock Issued During Period, Shares, Warrants Exercised (in shares) | shares | | | | | | | | | | 2,275,000 | 1,400,000 | | | | | | | | | | | | | | | | | | | |
Warrants and Rights Outstanding | | | | | | | | | | | $ 3,675,000 | | | | | $ 3,675,000 | | | $ 3,675,000 | | | | $ 5,250,000 | | | | | | | |
Proceeds from Warrant Exercises | | | | | | | | | | $ 3,185,000 | $ 1,960,000 | | | | | | | | | | | | | | | | | | | |
Conversion of Prepaid Advance to Common Stock [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Original Debt, Amount | | | | | | | | | | | | | | | | | | | | 2,500,000 | | 0 | | | | | | | | |
The 2023 Promissory Notes Converted into Common Stock [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares | | | | $ 2.5 | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Original Debt, Amount | | | | $ 1,875,000 | | | | | | | | | | | | | | | | 1,875,000 | | $ 0 | | | | | | | | |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares | | | | 750,000 | | | | | | | | | | | | | | | | | | | | | | | | | | |
Prepaid Advance Agreement [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Debt | | | $ 15,000,000 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Discount Percentage | | | 6% | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Convertible Debt | | | $ 14,100,000 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | | | $ 0.0001 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Maximum Monthly Advance Amount | | | $ 2,625,000 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares | | | $ 2.5 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | | | 93% | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Covenant, Default Interest Rate | | | 18% | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Payments of Financing Costs | | | | | | | | | | | | | | 888,000 | | | | | | | | | | | | | | | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) | | | | | | | | | | | | | | 21,000 | | | | | | | | | | | | | | | | |
Convertible Debt, Current | | | | | | | | | | | | | | 11,621,000 | | | | | | $ 11,621,000 | | | | | | | | | | |
Prepaid Advance Agreement [Member] | Conversion of Prepaid Advance to Common Stock [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Original Debt, Amount | | | | | | | | | | | | | | $ 2,500,000 | | | | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares | | | | | | | | | | | | | | 2,207,876 | | | | | | | | | | | | | | | | |
Prepaid Advance Agreement [Member] | Maximum [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Debt | | | $ 20,000,000 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Prepaid Advance Agreement [Member] | Minimum [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares | | | $ 0.28 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
The 2023 Promissory Notes [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | | | | $ 0.0001 | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Redemption Price, Percentage | | | | 115% | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Private Placement | | | | $ 12,500,000 | | | | | | | | | | | | | | | | | | | | | | | | | | |
Extinguishment of Debt, Amount | | | | 14,375,000 | | | | | | | | | | | | | | | | | | | | | | | | | | |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities | | | | 263,000 | | | | | | | | | | | | | | | | | | | | | | | | | | |
Gain (Loss) on Extinguishment of Debt | | | | (4,693,000) | | | | | | | | | | | | | | | | | | | | | | | | | | |
Unamortized Debt Issuance Expense | | | | $ 2,818,000 | | | | | | | | | | | | | | | | | | | | | | | | | | |
The 2023 Promissory Notes Converted into Common Stock [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares | | | | $ 2.5 | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Original Debt, Amount | | | | $ 1,875,000 | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares | | | | 750,000 | | | | | | | | | | | | | | | | | | | | | | | | | | |
The 2024 Public Offering [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, New Issues (in shares) | shares | | | | | 10,000,000 | | | | | | | | | | | | | | | | | | | | | | | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) | shares | | | | | | | | | | | | 1,500,000 | | | | | | | | | | | | | | | | | | |
Payments of Stock Issuance Costs | | | | | | | | | | | | $ 2,388,000 | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Common Stock | | | | | | | | | | | | $ 26,362,000 | | | | | | | | | | | | | | | | | | |
The 2024 Public Offering [Member] | Common Stock [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | | | | | $ 2.5 | | | | | | | | | | | | | | | | | | | | | | | | | |
The Purchase Agreement [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, New Issues (in shares) | shares | | | | | | | | | 6,100,000 | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance or Sale of Equity, Total | | | | | | | | $ 10,000,000 | | | | | | | | | | | | | | | | | | | | | | |
ATD [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares | | | | | | 2,832,135 | 3,496,464 | | | | | | | | | 2,832,135 | | | | | | | | | | | | | | |
ATD [Member] | Forecast [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares | | 664,329 | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| |
[1]On March 23, 2023, in connection with the 2023 Registered Direct Offering the Company issued warrants to the placement agent to purchase up to 481,100 shares of common stock. Each warrant for the placement agent is exercisable for one share of common stock at an exercise price of $1.8188 per share. These warrants were exercisable commencing March 27, 2023 and expire on March 27, 2028.[2]On July 25, 2023, in connection with the 2023 Letter Agreement, the Company issued warrants to purchase 2,850,000 shares of its common stock, exercisable over a period of five and half years, at an exercise price of $3.25 per share. These warrants were exercisable commencing July 25, 2023 and expire on January 25, 2029.[3]On January 18, 2023, in connection with the 2023 Promissory Notes, the Company issued warrants to the investors to purchase 6,250,000 shares of its common stock, exercisable over a period of five years, at an exercise price of $2.00 per share. These warrants were exercisable commencing January 18, 2023 and expire on January 18, 2028. As part of the Warrant Exercise Agreements, explained in detail above, the Exercising Holders reduced the number of warrants help by 1,575,000. | |