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Note 2 - Liquidity and Uncertainties (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2020
Apr. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Retained Earnings (Accumulated Deficit), Ending Balance     $ (106,582,501)   $ (106,582,501)   $ (100,885,957)
Net Income (Loss) Attributable to Parent, Total     (2,043,207) $ (1,490,989) (5,696,544) $ (6,257,668)  
Proceeds from Issuance of Common Stock         0 18,043,284  
Cash and Cash Equivalents, at Carrying Value, Ending Balance     $ 14,490,745   14,490,745   $ 14,223,917
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total         $ 266,828 $ 12,932,631  
April 6, 2020 Public Offering [Member]              
Proceeds from Issuance of Common Stock   $ 4,600,000          
June 30, 2020 Public Offering [Member]              
Proceeds from Issuance of Common Stock $ 13,400,000