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Note 3 - Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
      

Weighted-

 
      

average

 
      

Grant Date Fair

 
  

Units

  

Value Per Unit

 
         

Nonvested at January 1, 2022

  76,933  $23.01 

Granted

  25,414   24.80 

Vested

  (13,524)  25.52 

Nonvested at March 31, 2022

  88,823  $23.01 
         

Expected to vest as of March 31, 2022

  54,124  $24.05