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Note 10 - Share Based Payments - Non-vested Stock Options (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Non-vested stock options, shares (in shares) | 83,334 | 416,667
Non-vested stock options, Weighted average fair value (in dollars per share) | $ 0.47 | $ 0.47
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 150,000 | 0
Options granted, Weighted average fair value (in dollars per share) | $ 0.46 | $ 0
Vested during period, shares (in shares) | (83,334) | (83,833)
Vested during period, Weighted average fair value (in dollars per share) | $ (0.47) | $ (0.47)
Options cancelled, shares (in shares) | 0 | (250,000)
Options cancelled, Weighted average fair value (in dollars per share) | $ 0 | $ (0.80)
Non-vested shares under option, shares (in shares) | 150,000 | 83,334
Non-vested shares under option, Weighted average fair value (in dollars per share) | $ 0.46 | $ 0.47

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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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 Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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