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Note 14 - Subsequent Events (Details Textual) - USD ($) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Nov. 14, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Common Stock, Shares, Issued, Total |  | 48,199,073 |  | 33,859,034
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 1.49 |  | $ 2.55
Proceeds from Warrant Exercises |  | $ 1,974,547 |  |
Subsequent Event [Member] |  |  |  |
Common Stock, Shares, Issued, Total | 239,629 |  |  |
Subsequent Event [Member] | The 2019 Warrants [Member] |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 0.50 |  |  |
Proceeds from Warrant Exercises | $ 119,813 |  |  |

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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Period Type: | instant

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Details
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- Details
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