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Note 9 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 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 9 months 18 days 5 years 4 months 24 days
Granted, number of options (in shares) [1] 136,667  
Granted, weighted average exercise price per share (in dollars per share) [1] $ 3.06  
Granted, weighted average remaining contractual term (Year) [1] 9 years 9 months 18 days  
Granted(1) (in dollars per share) [1] $ 114,000  
Exercised, number of options (in shares) 0  
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) 397,667 302,333
Outstanding, weighted average exercise price per share (in dollars per share) $ 21.74 $ 25.68
Balance, aggregate intrinsic value $ 114  
Options exercisable, number of options (in shares) 249,001  
Options exercisable, weighted average exercise price per share (in dollars per share) $ 25.78  
Options exercisable, weighted average remaining contractual term (Year) 4 years 7 months 6 days  
Options exercisable, aggregate intrinsic value $ 0  
[1] Balance includes the stock options granted on June 3, 2024 to one employee of the Company totaling 16,667 that vest equally over four annual installments and are exercisable for ten years after the grant date.