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Note 9 - Derivative Liabilities - Liabilities Measured and Recognized at Fair Value (Details) - Fair Value, Inputs, Level 3 [Member]
12 Months Ended
Dec. 31, 2020
USD ($)
Balance $ 1,405,530
Additions 317,776
Amendments (224,066)
Retirements (567,588)
Change in fair value $ (931,652)