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Note 8 - Stock-based Compensation - Changes in the Number and Weighted-Average Grant-Date Fair Value (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2020 $ / shares shares
Non-vested stock option awards (in shares) | shares | 11,688
Weighted average grant-date fair value (in dollars per share) | $ / shares | $ 3.77
Stock option awards granted (in shares) | shares | 10,471
Stock option awards granted (in dollars per share) | $ / shares | $ 4.69
Stock option awards vested (in shares) | shares | (4,543)
Stock option awards vested (in dollars per share) | $ / shares | $ 4.12
Stock option awards forfeited (in shares) | shares | (1,596)
Stock option awards forfeited (in dollars per share) | $ / shares | $ 3.96
Non-vested stock option awards (in shares) | shares | 16,020
Weighted average grant-date fair value (in dollars per share) | $ / shares | $ 4.25

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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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- 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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