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Note 7 - Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2023
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, 2022 

  202,059  $33.29   362,965  $31.56 

Granted

  813   36.87       

Vested

  (1,660)  33.68   (136,808)  34.21 

Forfeited

  (1,395)  42.12       

Balance at June 30, 2023 

  199,817  $33.24   226,157  $29.96