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Note 9 - Stockholders' Equity - Warrants (Details) - USD ($) | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Outstanding, number of shares (in shares) | 1,592,775 | 1,074,171 | 1,592,775 |
Outstanding, weighted average exercise price (in dollars per share) | $ 2.55 | $ 0.50 | $ 2.55 |
Outstanding, weighted average remaining life (Year) | 2 years 109 days | 2 years 266 days | 4 years 36 days | 76 days
Outstanding, intrinsic value |  | $ 880,449 | $ 956,012 |
Issued, number of shares (in shares) | 1,749,171 | 6,459,000 |  |
Issued, weighted average exercise price (in dollars per share) | $ 0.50 | $ 2.01 |  |
Issued, weighted average remaining life (Year) | 4 years 127 days | 3 years |  |
Issued, intrinsic value | $ 560,199 |  |  |
Exercised, number of shares (in shares) | (57,750) | (1,133,975) |  |
Exercised, weighted average exercise price (in dollars per share) | $ 0.50 | $ 0.87 |  |
Expired or cancelled, number of shares (in shares) |  |  |  |
Expired or cancelled, weighted average exercise price (in dollars per share) |  |  |  |
Outstanding , number of shares (in shares) | 3,284,196 | 6,399,196 | 1,074,171 | 1,592,775
Outstanding , weighted average exercise price (in dollars per share) | $ 1.49 | $ 1.95 | $ 0.50 | $ 2.55

X
- Definition The number of warrants or rights exercised during period. + References No definition available. + Details
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X
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X
- Definition The number of warrants or rights expired or cancelled during period. + References No definition available. + Details
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- Definition The number of warrants or rights issued during period. + References No definition available. + Details
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X
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X
- Definition Represents the intrinsic value of warrants and rights issued in the period. + References No definition available. + Details
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X
- Definition Represents the weighted average remaining term of warrants and rights issued. + References No definition available. + Details
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- Definition Represents the weighted average remaining term of warrants and rights outstanding, + References No definition available. + Details
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X
- 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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X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
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