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Note 6 - Stock-based Compensation - Restricted Stock Units (Details)
 6 Months Ended
Jun. 30, 2025
$ / shares
shares
Time-based Restricted Stock Units [Member]  
Balance (in shares) | shares 202,466
Balance, weighted-average grant date fair value (in dollars per share) | $ / shares $ 34.7
Granted (in shares) | shares 65,667
Granted, weighted-average grant date fair value (in dollars per share) | $ / shares $ 45.65
Vested (in shares) | shares (50,540)
Vested, weighted-average grant date fair value (in dollars per share) | $ / shares $ 43.97
Forfeited (in shares) | shares (3,261)
Forfeited, weighted-average grant date fair value (in dollars per share) | $ / shares $ 38.89
Balance (in shares) | shares 214,332
Balance, weighted-average grant date fair value (in dollars per share) | $ / shares $ 35.81
Performance-based Restricted Stock Units [Member]  
Balance (in shares) | shares 339,914
Balance, weighted-average grant date fair value (in dollars per share) | $ / shares $ 33.02
Granted (in shares) | shares 89,777
Granted, weighted-average grant date fair value (in dollars per share) | $ / shares $ 46
Vested (in shares) | shares (104,318)
Vested, weighted-average grant date fair value (in dollars per share) | $ / shares $ 42.82
Forfeited (in shares) | shares (12,342)
Forfeited, weighted-average grant date fair value (in dollars per share) | $ / shares $ 37.91
Balance (in shares) | shares 313,031
Balance, weighted-average grant date fair value (in dollars per share) | $ / shares $ 33.28