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Note 6 - Share-based Compensation - Stock Option Transactions (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Outstanding, options (in shares) | shares 953,176  
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 14.73  
Outstanding, weighted average remaining life (Year) 3 years 5 months 1 day 2 years 9 months 18 days
Outstanding, aggregate intrinsic value | $ $ 4,169 $ 1,718
Granted (in shares) | shares 183,800 [1]  
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 14.38  
Exercised (in shares) | shares (119,303)  
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 10.66  
Lapsed or cancelled (in shares) | shares (174,478)  
Lapsed or cancelled, weighted average exercise price (in dollars per share) | $ / shares $ 16.26  
Outstanding, options (in shares) | shares 843,195 953,176
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 14.91 $ 14.73
Exercisable, options (in shares) | shares 341,940  
Exercisable, weighted average exercise price, options (in dollars per share) | $ / shares $ 18.57  
Exercisable, weighted average remaining life (Year) 2 years 3 months 7 days  
Exercisable, aggregate intrinsic value, options | $ $ 896  
[1] The weighted average grant date fair value of stock options granted was $4.27 per share.