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Note 8 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 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) 0  
Granted, weighted average exercise price per share (in dollars per share) $ 0  
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) 302,333 302,333
Outstanding, weighted average exercise price per share (in dollars per share) $ 25.68 $ 25.68
Options exercisable, number of options (in shares) 284,333  
Options exercisable, weighted average exercise price per share (in dollars per share) $ 24.91  
Options exercisable, weighted average remaining contractual term (Year) 5 years 1 month 6 days  
Options exercisable, aggregate intrinsic value $ 0