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Note 9 - Share Based Payments - Non-vested Stock Options (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Non-vested stock options, shares (in shares) | 1,340,000 | 1,685,000
Non-vested stock options, Weighted average fair value (in dollars per share) | $ 0.34 | $ 0.36
Options granted, shares (in shares) | 2,557,000 | 60,000
Options granted, Weighted average fair value (in dollars per share) | $ 0.10 | $ 0.06
Vested during period, shares (in shares) |  | (200,000)
Vested during period, Weighted average fair value (in dollars per share) |  | $ (0.52)
Options cancelled, shares (in shares) | (1,760,000) | (205,000)
Options cancelled, Weighted average fair value (in dollars per share) | $ (0.29) | $ (0.30)
Non-vested shares under option, shares (in shares) | 2,137,000 | 1,340,000
Non-vested shares under option, Weighted average fair value (in dollars per share) | $ 0.13 | $ 0.34

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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