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Note 5 - Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020
    
126,500
     $
8.94
      
4.1
     $
3,801,190
  
Vested and exercisable at September 30, 2020
    
102,500
     $
5.61
      
2.8
     $
3,421,390