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Note 6 - Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
  

Time-Based RSUs

  

Performance-Based RSUs

 
      

Weighted-Average

      

Weighted-Average

 
      

Grant Date

      

Grant Date

 
  

Shares

  

Fair Value

  

Shares

  

Fair Value

 

Balance at December 31, 2024

  202,466  $34.70   339,914  $33.02 

Granted

  65,667   45.65   89,777   46.00 

Vested

  (50,540)  43.97   (104,318)  42.82 

Forfeited

  (3,261)  38.89   (12,342)  37.91 

Balance at June 30, 2025

  214,332  $35.81   313,031  $33.28