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Note 17 - Compensation Plans - Summary of Nonvested Options (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Nonvested balance (in shares) | 2,256,959 | 2,459,929 | 2,911,770
Nonvested balance, Weighted Average Grant-Date Fair Value Per Share (in dollars per share) | $ 20.17 | $ 17.41 | $ 14.86
Number of options, granted (in shares) | 936,843 | 920,398 | 958,332
Weighted average grant date fair value per stock option (in dollars per share) | $ 25.87 | $ 24.13 | $ 21.48
Number of options, vested (in shares) | (942,049) | (947,708) | (1,117,513)
Vested, Weighted Average Grant-Date Fair Value Per Share (in dollars per share) | $ 18.30 | $ 17.29 | $ 14.79
Number of options, cancelled or expired (in shares) | (134,140) | (175,660) | (292,660)
Cancelled or expired, Weighted Average Grant-Date Fair Value Per Share (in dollars per share) | $ 22.40 | $ 17.77 | $ 15.33
Nonvested balance (in shares) | 2,117,613 | 2,256,959 | 2,459,929
Nonvested balance, Weighted Average Grant-Date Fair Value Per Share (in dollars per share) | $ 23.39 | $ 20.17 | $ 17.41

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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 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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