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Note 1 - Organization and Business (Details Textual) | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Apr. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Number of Countries in which Entity Operates |  |  | 60 |  |
Proceeds from Issuance of Common Stock |  |  | $ 0 | $ 18,003,037 |
Cash and Cash Equivalents, at Carrying Value, Ending Balance |  |  | 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 |  |  |  |

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