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Note 9 - Stockholders' Equity (Details Textual) |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 35 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2025 USD ($) $ / shares shares | Aug. 08, 2025 | Aug. 05, 2025 | May 02, 2024 USD ($) shares | Dec. 13, 2023 USD ($) | May 02, 2023 USD ($) | Dec. 31, 2025 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2026 USD ($) $ / shares shares | Mar. 31, 2025 USD ($) | Mar. 31, 2026 USD ($) $ / shares shares | Sep. 30, 2025 USD ($) shares | Mar. 31, 2023 USD ($)
Preferred Stock, Shares Issued (in shares) |  |  |  |  |  |  |  |  | 0 |  | 0 | 0 |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  |  |  |  | 0 |  | 0 | 0 |
Security Offering, Maximum Value of Securities, Shelf Registration | $ |  |  |  |  |  |  |  |  | $ 200,000,000 |  | $ 200,000,000 |  | $ 200,000,000
Security Offering, Remaining Value of Securities, Shelf Registration | $ |  |  |  |  |  |  |  |  | 33,300,000 |  | $ 33,300,000 |  |
Stock Issued During Period, Value, Issued for Services | $ |  |  |  |  |  |  |  | $ 98,020 |  |  |  |  |
The 2025 Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | 1 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ | $ 8,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 8,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 3 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Combined Public Offering Price (in dollars per share) | $ / shares | $ 3 |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ | $ 8,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Series B Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 8,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 3 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Combined Public Offering Price (in dollars per share) | $ / shares | $ 3 |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ | $ 6,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ | $ 23,400,000 |  |  |  |  |  |  |  | 23,366,345 | $ 0 |  |  |
Discounts and Commissions for Stock Issuance Costs | $ | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issuance Costs Payable | $ | 300,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ | $ 1,700,000 |  |  |  |  |  | $ 23,366,345 |  |  |  |  |  |
Lincoln Park Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  |  |  |  | 302,500 |  |
Stock Issued During Period, Value, New Issues | $ |  |  |  |  |  |  |  |  |  |  | $ 3,100,000 |  |
Shares Purchase Agreement, Value, Shares Authorized | $ |  |  |  |  | $ 50,000,000 | $ 100,000,000 |  |  |  |  |  |  |
Share Purchase Agreement, Term (Month) |  |  |  |  |  | 36 months |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services (in shares) |  |  |  | 80,000 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Services | $ |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |
Deferred Offering Costs | $ |  |  |  | 57,000 |  |  |  |  |  |  |  |  |
Deferred Costs | $ |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense | $ |  |  |  |  |  |  |  |  | $ 870,000,000,000 |  | $ 870,000,000,000 | $ 870,000,000,000 |
Lincoln Park Purchase Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Purchase Agreement, Value, Shares Authorized | $ |  |  |  |  | 50,000,000 | $ 100,000,000 |  |  |  |  |  |  |
Lincoln Park Purchase Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Purchase Agreement, Value, Shares Authorized | $ |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 10 | 10 |  |  |  |  |  |  |  |  |  |
Preferred Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  | 5,000,000 |  | 5,000,000 |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 |  |
Preferred Stock, Shares Issued (in shares) |  |  |  |  |  |  |  |  | 0 |  | 0 | 0 |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  |  |  |  | 0 |  | 0 | 0 |
Preferred Class, Series A-1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  | 1,040,000 |  | 1,040,000 |  |
Preferred Class, Series A-2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  | 1,500,000 |  | 1,500,000 |  |
Preferred Class, Series A-3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  | 700,000 |  | 700,000 |  |
Preferred Class, Series A-4 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  | 548,000 |  | 548,000 |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  | 15,000 |  | 15,000 |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.5 |  | $ 0.5 |  |
Preferred Stock, Shares Issued (in shares) |  |  |  |  |  |  |  |  | 0 |  | 0 | 0 |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  |  |  |  | 0 |  | 0 | 0 |

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