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Note 6 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]
   

# of Shares

   

Wgt Avg Exercise Price

   

Wgt Avg Remaining Contractual Life in Years

   

Aggregate
Intrinsic Value

 

Outstanding at September 30, 2021

    59,000     $ 17.35       6.9     $ 1,372,000  

Vested and exercisable at September 30, 2021

    49,000     $ 16.81       6.8     $ 1,166,000