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Note 8 - Financing Activities (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2024 | Jul. 26, 2024 | Jun. 30, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Jan. 29, 2025 | Sep. 27, 2024 | Dec. 31, 2023
Class of Warrant or Right, Issued During Period (in shares) |  |  |  | 0 | 28,572 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 2.36 | $ 56.63 | $ 1.41 |  |  | $ 50.96
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  | (930,511) | (0) |  |  |  |
The 2024 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  | $ 96,000 |  |  |  |  |
Prefunded Warrants 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  | 2,041,814 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 0.01 |  |  |  |  |  | $ 0.66 |
Class of Warrant or Right, Exercise Price, Percentage of Volume Weighted Average Prices |  | 90.00% |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price, Trading Days |  | 5 days |  |  |  |  |  |  |
Series F-1 Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  | 3,200,380 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 3,200,380 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 1.1 |  | $ 0.66 |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 5 years |  |  |  |  |  |  |
Series F-2 Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  | 3,200,380 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 3,200,380 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 1.1 |  | 0.66 |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  |  | 6 months |  |
Series F-3 Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  | 3,200,380 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 3,200,380 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 1.1 |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 1 year |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  | 527,784 |  |  |
Existing Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | 2.5 |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  | 90,381 |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  | $ 200,000 |  |  |  |  |  |
June 2024 Warrant [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 90,381 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 2.57 | $ 2.57 |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  | 5 years 6 months |  |  |  |  |
The 2024 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |
Modification of Warrants |  |  |  | $ (69) |  |  |  |  |
The 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 1,158,566 |  |  |  |  |  |  |
Maximum Percentage of Common Stock Outstanding |  | 4.99% |  |  |  |  |  |  |
Proceeds from Issuance of Stock and Warrants | $ 3,900,000 |  |  |  |  |  |  |  |
The 2024 Public Offering [Member] | Election of the holder prior to the date of issuance [Member] |  |  |  |  |  |  |  |  |
Maximum Percentage of Common Stock Outstanding |  | 9.99% |  |  |  |  |  |  |
Over-Allotment Option [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 336,832 |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Maximum Amount Purchasable By Underwriter [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 477,272 |  |  |  |  |  |  |
Option Period |  | 45 days |  |  |  |  |  |  |
Over-Allotment Option [Member] | Series F-1 Warrants [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) | 336,832 |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 336,832 |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Series F-1 Warrants [Member] | Maximum Amount Purchasable By Underwriter [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  | 477,272 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 477,272 |  |  |  |  |  |  |
Over-Allotment Option [Member] | Series F-2 Warrants [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) | 336,832 |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 336,832 |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Series F-2 Warrants [Member] | Maximum Amount Purchasable By Underwriter [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  | 477,272 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 477,272 |  |  |  |  |  |  |
Over-Allotment Option [Member] | Series F-3 Warrants [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) | 336,832 |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 336,832 |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Series F-3 Warrants [Member] | Maximum Amount Purchasable By Underwriter [Member] | Underwriter From 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  | 477,272 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 477,272 |  |  |  |  |  |  |

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