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Note 5 - Debt and Warrants Transactions (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] |
Notes Warrants |  | September 30, 2025 |  |  | December 31, 2024 |
Common stock market price |  | $ | 0.72 |  |  | $ | 1.31 |
Risk-free interest rate |  |  | 3.6 | % |  |  | 4.2 | %
Expected dividend yield |  |  | — |  |  |  | — |
Expected term (in years) |  |  | 1.86 |  |  |  | 2.61 |
Expected volatility |  |  | 121.7 | % |  |  | 105.9 | %
Additional Warrants |  | September 30, 2025 |  |  | December 31, 2024 |
Common stock market price |  | $ | 0.72 |  |  | $ | 1.31 |
Risk-free interest rate |  |  | 3.6 | % |  |  | 4.3 | %
Expected dividend yield |  |  | — |  |  |  | — |
Expected term (in years) |  |  | 2.37 |  |  |  | 3.12 |
Expected volatility |  |  | 115.7 | % |  |  | 99.6 | %

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