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Note 10 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Preferred Stock [Table Text Block]
   
June 30, 2020
   
December 31, 2019
 
           
Carrying
           
Carrying
 
   
Shares
   
Value
   
Shares
   
Value
 
Series B Convertible Preferred Stock
   
100
    $
76,095
     
100
    $
76,095
 
Series H Convertible Preferred Stock
   
-
     
-
     
1,686
     
1,156,338
 
Series I Convertible Preferred Stock
   
-
     
-
     
700
     
700,000
 
Series J Convertible Preferred Stock
   
300
     
300,000
     
-
     
-
 
Total
   
400
    $
376,095
     
2,486
    $
1,932,433
 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
 
Expiration
Date
 
Exercise
Price
   
Number of
Warrants
 
Series G Warrants
September 2021
  $
0.50
     
48
 
Series H Warrants
December 2021
   
0.50
     
217,392
 
Series I Warrants
Aug-Dec 2024
   
0.50
     
1,500,000
 
June 2020 Warrants
June 2025
   
0.50
     
2,400,000