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Note 8 - Stockholders' Equity - Warrants (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Outstanding, number of shares (in shares) | 1,592,775 |
Outstanding, weighted average exercise price (in dollars per share) | $ 2.55 |
Outstanding, weighted average remaining life (Year) | 2 years 109 days | 76 days
Outstanding, intrinsic value |  |
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 127 days |
Issued, intrinsic value | $ 560,199 |
Exercised, number of shares (in shares) | (57,750) |
Exercised, weighted average exercise price (in dollars per share) | $ 0.50 |
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 | 1,592,775
Outstanding , weighted average exercise price (in dollars per share) | $ 1.49 | $ 2.55
Outstanding, intrinsic value | $ 560,199 |

X
- Definition The number of warrants or rights exercised during period. + References No definition available. + Details
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Balance Type: | na
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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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X
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X
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