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Note 4 - Warrants to Purchase Common Stock (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   
Number of Shares
   
Exercise Price
   
Weighted Average
Remaining Life (in year)
 
Warrants as of December 31, 2019
   
84,295
   
 
$1.95
 
     
4.53
 
Issued during 2020
   
-
   
$0.01
-
$1.95
     
 
 
Exercise during 2020
   
(115,385
)  
 
$0.01
 
     
 
 
                           
Warrants as of December 31, 2021
   
479,554
   
 
$0.97
 
     
 
 
Warrants as of March 31, 2021    
479,554
   
 
$0.97
 
     
3.86