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Note 17 - Compensation Plans - Summary of Nonvested Options (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Nonvested balance (in shares) | 1,321,741 | 1,893,506 | 2,117,613
Nonvested balance, Weighted Average Grant-Date Fair Value Per Share (in dollars per share) | $ 34.65 | $ 28.49 | $ 23.39
Number of options, granted (in shares) | 211,945 | 653,802 | 750,822
Granted, Weighted Average Grant-Date Fair Value Per Share (in dollars per share) | $ 52.69 | $ 42.25 | $ 35.15
Number of options, vested (in shares) | (540,993) | (964,156) | (825,850)
Vested, Weighted Average Grant-Date Fair Value Per Share (in dollars per share) | $ 33.08 | $ 22.97 | $ 21.62
Number of options, cancelled or expired (in shares) | (227,436) | (261,411) | (149,079)
Cancelled or expired, Weighted Average Grant-Date Fair Value Per Share (in dollars per share) | $ 38.03 | $ 35.23 | $ 27.54
Nonvested balance (in shares) | 765,257 | 1,321,741 | 1,893,506
Nonvested balance, Weighted Average Grant-Date Fair Value Per Share (in dollars per share) | $ 39.74 | $ 34.65 | $ 28.49

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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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