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Note 8 - Stockholders' Equity - Outstanding Stock Purchase Warrants (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Outstanding, shares (in shares) | 32,751,578 | 56,442,157
Outstanding, weighted average exercise price (in dollars per share) | $ 0.07 | $ 0.14
Exercised, shares (in shares) | (983,334) | 21,884,420
Exercised, weighted average exercise price (in dollars per share) | $ 0.05 | $ 0.06
Forfeited or expired, shares (in shares) | (1,112,001) | 1,806,159
Forfeited or expired, weighted average exercise price (in dollars per share) | $ 0.57 | $ 1
Outstanding, shares (in shares) | 30,656,243 | 32,751,578
Outstanding, weighted average exercise price (in dollars per share) | $ 0.05 | $ 0.07
Exercisable, shares (in shares) | 30,656,243 |
Exercisable, weighted average exercise price (in dollars per share) | $ 0.05 |

X
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X
- Definition Number of warrants or rights exercisable. + References No definition available. + Details
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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/presentationRef -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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