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Note 2 - Liquidity (Details Textual) - USD ($) | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2021 | Mar. 15, 2021 | Mar. 12, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Proceeds from Issuance of Common Stock |  |  |  | $ 10,827,100 |
Proceeds from Warrant Exercises |  |  |  | $ 8,046,103 | $ 3,888,425
Subsequent Event [Member] |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 1,000,000 |  |  |  |
Proceeds from Warrant Exercises |  | $ 2,200,000 | $ 2,000,000 |  |

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