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Note 5 - Stock-based Compensation; Changes in Equity (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Share-based Payment Arrangement, Activity [Table Text Block]
   
Shares under
Option
   
Weighted
Average
Exercise
Price
 
Balance at December 31, 2020
   
195,160
    $
1.00
 
Granted
   
-
     
1.00
 
Cancelled/Expired
   
-
     
1.00
 
Exercised/Issued
   
(195,160
)
   
1.00
 
Outstanding at March 31, 2021
   
-
     
1.00
 
                 
Exercisable at March 31, 2021
   
-
    $
1.00