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Note 4 - Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 18, 2025 | Jun. 30, 2025 | Nov. 08, 2024 | Oct. 03, 2024 | Jul. 11, 2024 | May 10, 2024 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Sep. 29, 2024 | May 14, 2024
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  | $ 1.41 |  | $ 1.74 |  |
Proceeds from Issuance or Sale of Equity |  |  |  |  |  |  |  | $ 966 | $ 3,351 |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  |  |  |  | 12,546,330 |  | 8,382,048 |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  |  |  |  |  | 1 |  | 1 |  |
Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  | $ 0.001 |  |  |  |
Class Of Warrant Or Right, Exercised In Period (in shares) |  |  |  |  |  |  | 845,000 |  | 845,000 |  |  |
Stock Issued During Period, Shares, Exercise of Warrants (in shares) |  | 845,000 |  |  |  |  | 844,061 |  |  |  |  |
Roth Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  | 20,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1.46 |
Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  | 1,065,000 |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  |  | $ 2.15 |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  |  |  | $ 3,400 |  |  |  |  |  |  |
Securities Purchase Agreement [Member] | Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  | 845,000 |  |  |  |  |  |
Class of Warrant or Right, Purchase Price of Warrants (in dollars per share) |  |  |  |  |  | $ 2.149 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  | $ 0.001 |  |  |  |  |  |
Securities Purchase Agreement [Member] | Unregistered Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,910,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 2.34
Securities Purchase Agreement [Member] | Roth Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  | 133,700
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 2.86
Percent of Aggregate Share and Warrants |  |  |  |  |  |  |  |  |  |  |  | 7.00%
Registered Direct Offering And Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 1,500 |  | $ 6,600 | $ 6,900 |  |  |  |  |  |  |  |
Sale of Stock, Ownership Limitation on Sale of Shares, Percent | 19.90% |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Service Fee, Percentage of Gross Proceeds | 1.00% |  |  |  |  |  |  |  |  |  |  |
October 2024 Registered Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 3,321,881 |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  |  | $ 3,900 |  |  |  |  |  |  |  |
October 2024 Registered Offering [Member] | Related Party [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  |  | $ 200 |  |  |  |  |  |  |  |
October 2024 Private Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 2,575,107 |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  |  | $ 3,000 |  |  |  |  |  |  |  |
October 2024 Offerings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  | $ 1.165 |  |  |  |  |  |  |  |
October 2024 Offerings [Member] | Unregistered Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 1.04 |  |  |  |  |  |  |  |
Registered Direct Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 1,612,903 |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 0.93 |  |  |  |  |  |  |  |  |  |  |
Private Placement [Member] | Unregistered Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.2 |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 5 years |  |  |  |  |  |  |  |  |  |  |

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