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Note 6 - Stock Compensation Plan (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
  

Shares

 Weighted-Average Grant-date Fair Value

Nonvested at January 1, 2021

  47,950  $28.83 

Granted

      

Vested

      

Forfeited

      

Nonvested as of June 30, 2021

  47,950  $28.83