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Note 8 - Stockholders' Equity - Warrants (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Outstanding, number of shares (in shares) | 1,500,000 |
Outstanding, weighted average exercise price (in dollars per share) | $ 2.55 |
Outstanding, weighted average remaining life (Year) | 2 years 343 days | 266 days
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 |
Exercised, number of shares (in shares) |  |
Exercised, weighted average exercise price (in dollars per share) |  |
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) | 3,249,171 | 1,500,000
Outstanding , weighted average exercise price (in dollars per share) | $ 1.45 | $ 2.55
Exercisable , number of shares (in shares) | 3,249,171 |
Exercisable, weighted average exercise price (in dollars per share) | $ 1.45 |
Exercisable, weighted average remaining life (Year) | 2 years 343 days |

X
- Definition he number of warrants or rights exercisable during period. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
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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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