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Note 2 - Liquidity and Going Concern Considerations (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Net Income (Loss) Attributable to Parent, Total $ (6,458,382) $ (4,936,182)
Retained Earnings (Accumulated Deficit), Ending Balance (178,750,634) $ (172,292,252)
Working Capital $ (1,900,000)