Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Liquidity and Uncertainties (Details Textual)

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Note 2 - Liquidity and Uncertainties (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
Apr. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Retained Earnings (Accumulated Deficit), Ending Balance     $ (104,539,294)   $ (104,539,294)   $ (100,885,957)
Net Income (Loss) Attributable to Parent, Total     (2,680,468) $ (3,166,464) (3,653,337) $ (4,766,679)  
Proceeds from Issuance of Common Stock         0 18,003,037  
Cash and Cash Equivalents, at Carrying Value, Ending Balance     $ 15,977,330   15,977,330   $ 14,223,917
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total         $ 1,753,413 $ 15,093,945  
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