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Note 5 - Related Party Transactions (Tables)
 3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Related Party Transactions [Table Text Block]
 
Maturity
Date
  
Stated
Interest
Rate
    
Conversion
Price
    
Face Value
    
Remaining
Debt
Discount
    
Carrying
Value
  
At March 31, 2021
3/6/2022
    
22%
     $
1.80
     $
10,000,000
     $
(3,238,000
 )   $
6,762,000
  
At December 31, 2020
3/6/2022
    
22%
     $
1.80
     $
10,000,000
     $
(4,065,000
 )   $
5,935,000