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Note 8 - Share-based Compensation - Unvested Balance of Options (Details) - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Unvested, number of unvested options (in shares) 123,833  
Unvested, weighted average exercise price per share (in dollars per share) $ 29.72  
Unvested, weighted average remaining contractual term (Year) 6 years 10 months 24 days 5 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) (105,833)  
Vested, weighted average exercise price per share (in dollars per share) $ 0  
Unvested, number of unvested options (in shares) 18,000 123,833
Unvested, weighted average exercise price per share (in dollars per share) $ 37.98 $ 29.72