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Note 8 - Bridge Financing - Convertible Debentures - Carrying Value of the Convertible Debentures (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Jun. 26, 2020
Dec. 31, 2019
Carrying value at June 30, 2020 $ 435,711  
Convertible Debentures [Member]      
Principal value 1,200,000 $ 1,200,000  
Debt discount (769,334)    
Net original carrying value 430,666    
Amortization of debt discount 5,045    
Carrying value at June 30, 2020 $ 435,711