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Note 8 - Share-based Compensation - Unvested Balance of Options (Details) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 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) 8 years 2 months 12 days 5 years 4 months 24 days
Granted, number of unvested options (in shares) [1] 16,667  
Granted, weighted average exercise price per share (in dollars per share) [2] $ 3.36  
Granted, weighted average remaining contractual term (Year) 9 years 10 months 24 days  
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) (105,834)  
Vested, weighted average exercise price per share (in dollars per share) $ 0  
Unvested, number of unvested options (in shares) 34,666 123,833
Unvested, weighted average exercise price per share (in dollars per share) $ 21.34 $ 29.72
[1] On June 3, 2024, one employee of the Company was granted stock options that vest equally over four annual installments and are exercisable for ten years after the grant date.
[2] On June 3, 2024, one employee of the Company was granted stock options that vest equally over four annual installments and are exercisable for ten years after the grant date.