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Note 8 - Stockholders' Equity - Warrants (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Outstanding, number of shares (in shares) | 1,074,171 | 1,500,000 | 1,500,000 |
Outstanding, weighted average exercise price (in dollars per share) | $ 0.50 | $ 2.55 | $ 2.55 |
Outstanding, weighted average remaining life (Year) | 3 years 310 days | 2 years 343 days | 4 years 36 days | 354 days
Outstanding, intrinsic value |  |  | $ 956,012 |
Issued, number of shares (in shares) |  | 1,749,171 |  |
Issued, weighted average exercise price (in dollars per share) |  | $ 0.50 |  |
Issued, weighted average remaining life (Year) |  | 4 years 310 days |  |
Issued, intrinsic value |  |  |  |
Exercised, number of shares (in shares) | (460,725) |  |  |
Exercised, weighted average exercise price (in dollars per share) | $ 0.50 |  |  |
Exercised, intrinsic value | $ 630,389 |  |  |
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) | 613,446 | 3,249,171 | 1,074,171 | 1,500,000
Outstanding , weighted average exercise price (in dollars per share) | $ 0.50 | $ 1.45 | $ 0.50 | $ 2.55
Exercisable, number of shares (in shares) | 613,446 | 3,249,171 |  |
Exercisable, weighted average exercise price (in dollars per share) | $ 0.50 | $ 1.45 |  |
Exercisable, weighted average remaining life (Year) | 3 years 310 days | 2 years 343 days |  |
Exercisable, intrinsic value | $ 460,085 |  |  |

X
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X
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- Definition The number of warrants or rights exercised 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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- 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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