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Note 7 - Derivative Liabilities - Liabilities Measured and Recognized at Fair Value (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Inputs, Level 1 [Member]    
Balance
Additions
Change in Fair Value
Amendments  
Retirements  
Balance
Fair Value, Inputs, Level 2 [Member]    
Balance
Additions
Change in Fair Value
Amendments  
Retirements  
Balance
Fair Value, Inputs, Level 3 [Member]    
Balance 1,405,530
Additions 317,776 1,321,764
Change in Fair Value (942,176) 83,766
Amendments (224,066)  
Retirements (522,065)  
Balance $ 34,999 $ 1,405,530