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Note 8 - Stock-Based Compensation - Fair Value Assumptions (Details)
 9 Months Ended
Sep. 30, 2025
$ / shares
Strike price (in dollars per share) $ 1.38
Risk-free rate, minimum 3.90%
Risk-free rate, maximum 4.50%
Expected dividend yield 0.00%
Expected volatility, minimum 94.50%
Expected volatility, maximum 98.10%
Expected term (in years) (Year) 6 years
Minimum [Member]  
Strike price (in dollars per share) $ 0.9
Grant date fair value (in dollars per share) 0.7
Maximum [Member]  
Strike price (in dollars per share) 1.85
Grant date fair value (in dollars per share) $ 1.47