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Note 6 - Share-based Compensation - Stock Option Transactions (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 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 3 months 3 days 2 years 9 months 18 days
Outstanding, aggregate intrinsic value | $ $ 2,165 $ 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 (122,395)  
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 10.71  
Lapsed or cancelled (in shares) | shares (199,984)  
Lapsed or cancelled, weighted average exercise price (in dollars per share) | $ / shares $ 16.49  
Outstanding, options (in shares) | shares 814,597 953,176
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 14.82 $ 14.73
Exercisable, options (in shares) | shares 341,469  
Exercisable, weighted average exercise price, options (in dollars per share) | $ / shares $ 18.59  
Exercisable, weighted average remaining life (Year) 2 years 2 months 19 days  
Exercisable, aggregate intrinsic value, options | $ $ 494  
[1] The weighted average grant date fair value of stock options granted was $4.27 per share.