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Note 10 - Commitments and Contingencies (Details Textual) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 19, 2024 USD ($) $ / shares shares | Mar. 12, 2024 shares | Jan. 31, 2025 shares | Sep. 30, 2024 USD ($) shares | Jun. 30, 2024 USD ($) shares | May 31, 2024 USD ($) $ / shares shares | May 31, 2018 USD ($) | Dec. 31, 2024 USD ($) ft² $ / shares shares | Dec. 31, 2023 USD ($) shares | Aug. 31, 2024 shares | Dec. 22, 2023
Operating Lease, Expense |  |  |  |  |  |  |  | $ 141,000 | $ 163,000 |  |
Stock Issued During Period, Shares, New Issues | shares |  |  | 262,501 |  |  |  |  | 262,501 |  |  |
Director [Member] |  |  |  |  |  |  |  |  |  |  |
Consulting Agreement, Monthly Payment |  |  |  |  |  |  | $ 7,500 |  |  |  |
Consulting Agreement, Renewal Period |  |  |  |  |  |  | 1 year |  |  |  |
Director [Member] | Consulting Fees [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  |  | $ 90,000 | $ 90,000 |  |
Certain Claims Arising From an Interpretation of Certain Rights of SPA [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares | 500,000 | 500,000 |  |  |  |  |  |  | 760,000 |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | $ 1.85 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ 924,000 |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Fee Expense |  |  |  |  |  |  |  | $ 164,000 |  |  |
Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  |  |  |  | 0.0384 |  |
Measurement Input, Price Volatility [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  |  |  | 1.01 |  |  | 0.98
Series AA Preferred Additional Investment Rights [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) |  |  |  | $ 70,000 | $ 294,000 |  |  |  |  |  |
Class of Warrant or Right, Exchanged During Period (in shares) | shares |  |  |  | 3,336,293 | 3,215,232 | 642,962 |  |  |  | 667,289 |
Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  |  |  | 0.0427 |  |  |
Minimum [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  |  |  | 2.71 | 4.5 |  |
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  |  |  | 0.0438 |  |  |
Maximum [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  |  |  | 4.74 | 5 |  |
Pioneer Capital Anstalt [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period | shares |  |  |  |  |  | 550,000 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Granted, Aggregate Intrinsic Value |  |  |  |  |  | $ 516,000 |  |  |  |  |
Pioneer Capital Anstalt [Member] | Series AA Preferred Additional Investment Rights [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) |  |  |  |  |  |  |  | $ 213,000 |  |  |
Class of Warrant or Right, Exchanged During Period (in shares) | shares |  |  |  |  |  | 372,610 |  | 1,863,049 |  |  |
Pioneer Capital Anstalt [Member] | Series AA Preferred Additional Investment Rights [Member] | Measurement Input, Share Price [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  | 0.86 |  |  |  |  |
Pioneer Capital Anstalt [Member] | Series AA Preferred Additional Investment Rights [Member] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Extension Period of Exercise |  |  |  |  |  |  |  | 6 months |  |  |
Pioneer Capital Anstalt [Member] | Minimum [Member] | Series AA Preferred Additional Investment Rights [Member] | Measurement Input, Conversion Price [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  | 1.886 |  |  |  |  |
Pioneer Capital Anstalt [Member] | Minimum [Member] | Series AA Preferred Additional Investment Rights [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  | 0.0513 |  |  |  |  |
Pioneer Capital Anstalt [Member] | Minimum [Member] | Series AA Preferred Additional Investment Rights [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  | 0.52 |  |  |  |  |
Pioneer Capital Anstalt [Member] | Minimum [Member] | Series AA Preferred Additional Investment Rights [Member] | Measurement Input, Price Volatility [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  | 0.80 |  |  |  |  |
Pioneer Capital Anstalt [Member] | Minimum [Member] | Series AA Preferred Additional Investment Rights [Member] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price | $ / shares |  |  |  |  |  | $ 9.43 |  |  |  |  |
Preferred Stock, Convertible, Conversion Price Floor | $ / shares |  |  |  |  |  | $ 1.886 |  |  |  |  |
Pioneer Capital Anstalt [Member] | Maximum [Member] | Series AA Preferred Additional Investment Rights [Member] | Measurement Input, Conversion Price [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  | 13.04 |  |  |  |  |
Pioneer Capital Anstalt [Member] | Maximum [Member] | Series AA Preferred Additional Investment Rights [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  | 0.0536 |  |  |  |  |
Pioneer Capital Anstalt [Member] | Maximum [Member] | Series AA Preferred Additional Investment Rights [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  | 1.02 |  |  |  |  |
Pioneer Capital Anstalt [Member] | Maximum [Member] | Series AA Preferred Additional Investment Rights [Member] | Measurement Input, Price Volatility [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  | 0.93 |  |  |  |  |
Pioneer Capital Anstalt [Member] | Maximum [Member] | Series AA Preferred Additional Investment Rights [Member] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price | $ / shares |  |  |  |  |  | $ 13.04 |  |  |  |  |
Preferred Stock, Convertible, Conversion Price Floor | $ / shares |  |  |  |  |  |  |  | $ 2.608 |  |  |
Office Space [Member] |  |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property | ft² |  |  |  |  |  |  |  | 1,550 |  |  |
Operating Lease, Monthly Payments |  |  |  |  |  |  |  | $ 7,000 |  |  |

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