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Note 15 - Subsequent Events (Details Textual) - USD ($) | 2 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 16, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2021 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 1.95 |  |  | $ 0.50 | $ 1.49 | $ 2.55
Proceeds from Warrant Exercises |  | $ 985,763 | $ 28,875 |  |  |  |
Forecast [Member] | Consultant [Member] |  |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Services |  |  |  | $ 60,000 |  |  |
First Warrants Exercised Subsequent to June 30, 2020 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Stock Issued During Period Shares, Warrants Exercised (in shares) | 8,000 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.20 |  |  |  |  |  |
Proceeds from Warrant Exercises | $ 9,600 |  |  |  |  |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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