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Note 8 - Share-based Compensation - Unvested Balance of Options (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Unvested, number of unvested options (in shares) 148,666  
Unvested, weighted average exercise price per share (in dollars per share) $ 5.66  
Unvested, weighted average remaining contractual term (Year) 8 years 9 months 18 days 9 years 4 months 24 days
Granted, number of unvested options (in shares) 0  
Granted, weighted average exercise price per share (in dollars per share) $ 0  
Forfeited, number of unvested options (in shares) 0  
Forfeited, weighted average exercise price per share (in dollars per share) $ 0  
Vested, number of unvested options (in shares) (6,000)  
Vested, weighted average exercise price per share (in dollars per share) $ 0  
Unvested, number of unvested options (in shares) 142,666 148,666
Unvested, weighted average exercise price per share (in dollars per share) $ 4.3 $ 5.66