Note 9 - Stockholders' Equity (Details Textual) - USD ($) | | | | | | 3 Months Ended | 20 Months Ended | | |
May 02, 2024 | Dec. 18, 2023 | Dec. 13, 2023 | May 12, 2023 | May 02, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Sep. 30, 2024 | Mar. 31, 2023 |
Preferred Stock, Shares Issued (in shares) | | | | | | 0 | | 0 | 0 | |
Security Offering, Maximum Value of Securities, Shelf Registration | | | | | | | | | | $ 200,000,000 |
Security Offering, Remaining Value of Securities, Shelf Registration | | | | | | $ 109,000,000 | | $ 109,000,000 | | |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | | | | | | | $ 164,313 | | | |
Preferred Stock, Shares Outstanding (in shares) | | | | | | 0 | | 0 | 0 | |
Public Offering [Member] | | | | | | | | | | |
Stock Issued During Period, Shares, New Issues (in shares) | | 52,708,332 | | | | | | | | |
Shares Issued, Price Per Share (in dollars per share) | | $ 0.72 | | | | | | | | |
Proceeds from Issuance or Sale of Equity | | $ 35,200,000 | | | | $ 0 | 35,378,888 | | | |
Stock Issued During Period, Value, New Issues | | | | | | | $ 35,229,415 | | | |
Lincoln Park Purchase Agreement [Member] | | | | | | | | | | |
Stock Issued During Period, Shares, New Issues (in shares) | | | | | | 0 | 1,800,000 | 3,025,000 | | |
Proceeds from Issuance or Sale of Equity | | | | | | $ 0 | $ 1,661,490 | | | |
Shares Purchase Agreement, Value, Shares Authorized | | | $ 50,000,000 | | $ 100,000,000 | | | | | |
Share Purchase Agreement, Term (Month) | | | | | 36 months | | | | | |
Shares Purchase Agreement, Shares Authorized (in shares) | | | | | 225,000 | | | | | |
Shares Purchase Agreement, Value, Maximum Commitment | | | | | $ 2,500,000 | | | | | |
Shares Purchase Agreement, Shares, Maximum Commitment (in shares) | | | | | 2,000,000 | | | | | |
Shares Purchase Agreement, Accelerated Purchase Date, Percent Of Trading Volume | | | | | 30% | | | | | |
Shares Purchase Agreement, Accelerated Purchase Date, Purchase Price, Percent | | | | | 97% | | | | | |
Shares Purchase Agreement, Shares Authorized, Aggregate Maximum (in shares) | | | | | 17,678,502 | | | | | |
Shares Purchase Agreement, Shares Authorized, Percentage of Common Shares Oustanding | | | | | 19.99% | | | | | |
Stock Issued During Period, Value, New Issues | | | | | | | 1,661,490 | $ 3,100,000 | | |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | | | | | | | 164,000 | | | |
Stock Issued During Period, Shares, Issued for Services (in shares) | 800,000 | | | | | | | | | |
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 | | $ 870,000 | $ 870,000 | |
Lincoln Park Purchase Agreement [Member] | Shares Required to be Purchased if Closing Price is $6.00 or Above [Member] | | | | | | | | | | |
Shares Issued, Price Per Share (in dollars per share) | | | | | $ 6 | | | | | |
Shares Purchase Agreement, Shares Authorized (in shares) | | | | | 250,000 | | | | | |
Lincoln Park Purchase Agreement [Member] | Shares Required to be Purchased if Closing Price is $8.00 or Above [Member] | | | | | | | | | | |
Shares Issued, Price Per Share (in dollars per share) | | | | | $ 8 | | | | | |
Shares Purchase Agreement, Shares Authorized (in shares) | | | | | 275,000 | | | | | |
Lincoln Park Purchase Agreement [Member] | Maximum [Member] | | | | | | | | | | |
Shares Issued, Price Per Share (in dollars per share) | | | | | $ 0.25 | | | | | |
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 | | | | | | | |
Lincoln Park Purchase Agreement [Member] | Weighted Average [Member] | | | | | | | | | | |
Shares Issued, Price Per Share (in dollars per share) | | | | | $ 1.26 | | | | | |
Jefferies Sales Agreement [Member] | | | | | | | | | | |
Stock Issued During Period, Shares, New Issues (in shares) | | | | | | 90,156 | | | | |
Proceeds from Issuance or Sale of Equity | | | | | | $ 0 | 66,551 | | | |
Shares Purchase Agreement, Value, Shares Authorized | | | | $ 75,000,000 | | | | | | |
Stock Issued During Period, Value, New Issues | | | | | | $ 67,000 | $ 66,551 | | | |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | | | | 39,609,072 | | | | | | |
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) | | | | | | $ 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) | | | | | | $ 0.5 | | $ 0.5 | | |
Preferred Stock, Shares Issued (in shares) | | | | | | 0 | 0 | 0 | | |
Stock Issued During Period, Shares, Period Increase (Decrease) (in shares) | | | | | | 0 | | | | |
Preferred Stock, Shares Outstanding (in shares) | | | | | | 0 | 0 | 0 | | |
Preferred Stock [Member] | | | | | | | | | | |
Stock Issued During Period, Shares, Period Increase (Decrease) (in shares) | | | | | | | 0 | | | |