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Note 4 - Stockholders' Equity (Q3) (Details) - USD ($)
1 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Equity Awards [Abstract]            
Proceeds from Issuance of Common Stock and Warrants $ 2,800,000   $ 2,783,425    
Stock Issued During Period, Shares, New Issues (in shares) 1,515,878          
Class of Warrant or Right, Number of Warrants Issued (in shares) 871,630          
Warrants and Rights Outstanding $ 1,000,000          
Payments of Stock Issuance Costs $ 391,581          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   0 0 0 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value     $ 0 $ 0 $ 0 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value     $ 0   $ 0