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Note 11 - Share-based Compensation - Unvested Balance of Options (Details) - $ / shares
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Unvested, number of unvested options (in shares) 897,000  
Unvested, weighted average exercise price per share (in dollars per share) $ 4.91  
Unvested, weighted average remaining contractual term (Year) 5 years 4 months 24 days 6 years 3 months 18 days
Forfeited, number of unvested options (in shares) (154,000)  
Forfeited, weighted average exercise price per share (in dollars per share) $ 7.38  
Unvested, number of unvested options (in shares) 743,000 897,000
Unvested, weighted average exercise price per share (in dollars per share) $ 4.95 $ 4.91