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v3.21.1

Note 15 - Subsequent Events (Details Textual) - USD ($) |  |  |  | 3 Months Ended | 13 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 24, 2021 | May 19, 2021 | Jul. 10, 2017 | Mar. 31, 2021 | Mar. 31, 2020 | May 14, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 2.14 | $ 0.50 |  | $ 1.49 | $ 0.50
Proceeds from Warrant Exercises |  |  |  | $ 3,012,216 | $ 230,362 |  |  |
Previous President and Chief Executive Officer [Member] |  |  |  |  |  |  |  |
Increase (Decrease) in Deferred Compensation |  |  | $ 100,000 |  |  |  |  |
Employment Agreement, Base Compensation |  |  | 200,000 |  |  |  |  |
Consultant [Member] |  |  |  |  |  |  |  |
Increase (Decrease) in Deferred Compensation |  |  | 100,000 |  |  |  |  |
Employment Agreement, Base Compensation |  |  | $ 200,000 |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services (in shares) |  |  | 2,000,000 |  |  |  |  |
Compensation Agreement, Term (Year) |  |  | 5 years |  |  |  |  |
Chief Financial Officer [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Employment Agreement, Base Compensation | $ 200,000 |  |  |  |  |  |  |
Subsequent Event [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |
Employment Agreement, Base Compensation |  | $ 350,000 |  |  |  |  |  |
Employment Agreement, Annual Bonuses |  | $ 400,000 |  |  |  |  |  |
Warrants with 0.50 Exercise Price [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Stock Issued During Period Shares, Warrants Exercised (in shares) |  |  |  |  |  | 52,000 |  |
Warrants with 1.20 Exercise Price [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  | $ 1.20 |  |
Proceeds from Warrant Exercises |  |  |  |  |  | $ 62,400 |  |
Warrants with 2.60 Exercise Price [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Stock Issued During Period Shares, Warrants Exercised (in shares) |  |  |  |  |  | 25,000 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  | $ 2.60 |  |
Proceeds from Warrant Exercises |  |  |  |  |  | $ 65,000 |  |

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