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Note 15 - Stock-based Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
      

Weighted

 
  

Number

  

Average

 
  

of

  

Grant-Date

 
  

Shares

  

Fair Value

 
         

Nonvested at beginning of year

  27,750  $41.08 

Granted

  14,250   67.43 

Vested

  (9,350)  36.37 

Forfeited

  -   - 
         

Nonvested at end of year

  32,650  $53.93