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Note 8 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Outstanding, number of options (in shares) 302,333  
Outstanding, weighted average exercise price per share (in dollars per share) $ 25.68  
Outstanding, weighted average remaining contractual term (Year) 5 years 2 months 12 days 5 years 4 months 24 days
Granted, number of options (in shares) [1] 16,667  
Granted, weighted average exercise price per share (in dollars per share) [1] $ 3.36  
Granted, weighted average remaining contractual term (Year) 9 years 10 months 24 days  
Exercised, number of options (in shares) (20,666)  
Exercised, weighted average exercise price per share (in dollars per share) $ 0  
Forfeited, weighted average exercise price per share (in dollars per share) $ 0  
Outstanding, number of options (in shares) 298,334 302,333
Outstanding, weighted average exercise price per share (in dollars per share) $ 25.15 $ 25.68
Options exercisable, number of options (in shares) 263,668  
Options exercisable, weighted average exercise price per share (in dollars per share) $ 25.65  
Options exercisable, weighted average remaining contractual term (Year) 4 years 9 months 18 days  
Options exercisable, aggregate intrinsic value $ 0  
[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.