XML 16 R19.htm IDEA: XBRL DOCUMENT v3.19.3
Note 5 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2019
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, 2019
   
153,500
    $
7.68
     
4.7
    $
5,197,170
 
Vested and exercisable at September 30, 2019
   
111,500
    $
2.11
     
3.0
    $
4,396,270