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Note 13 - Subsequent Events (Details Textual) - USD ($) | Mar. 24, 2021 | Mar. 24, 2021 | Feb. 26, 2021 | Jan. 06, 2021 | May 21, 2020 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | ---
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 1,085,000 |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001
Subsequent Event [Member] | March 2021 Purchase Agreement [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 80,000 |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 | $ 0.001 |  |  |  |  |
Debt Instrument, Purchase Price Upon the Satisfaction of Conditions in the Agreement, Amount |  | $ 15,000,000 |  |  |  |  |
Subsequent Event [Member] | Senior Convertible Note Due in 2023 [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 15,000,000 | $ 15,000,000 |  |  |  |  |
Board of Directors Chairman [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services (in shares) |  |  |  | 11,218 |  |  |
Stock Issued During Period, Value, Issued for Services |  |  |  | $ 70,000 |  |  |
Management [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services (in shares) |  |  | 30,694 |  |  |  |
Stock Issued During Period, Value, Issued for Services |  |  | $ 166,667 |  |  |  |

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