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Note 5 - Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Years ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Restricted share units |  |  |  |  |  |  |  |  |  |  |  |
Pretax compensation expense |  | $ | 56,837 |  |  | $ | 54,276 |  |  | $ | 44,505 |
Tax benefit |  |  | 12,561 |  |  |  | 13,216 |  |  |  | 10,637 |
Restricted share units, net of tax |  | $ | 44,276 |  |  | $ | 41,060 |  |  | $ | 33,868 |
Performance share units |  |  |  |  |  |  |  |  |  |  |  |
Pretax compensation expense |  | $ | 22,352 |  |  | $ | 23,259 |  |  | $ | 17,000 |
Tax benefit |  |  | 4,940 |  |  |  | 5,664 |  |  |  | 4,063 |
Performance share awards, net of tax |  | $ | 17,412 |  |  | $ | 17,595 |  |  | $ | 12,937 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
Restricted Share Units |  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested at December 31, 2020 |  |  | 1,345,146 |  |  | $ | 97.22 |
Granted |  |  | 360,734 |  |  |  | 150.33 |
Vested |  |  | (387,948 | ) |  |  | 100.36 |
Forfeited |  |  | (27,700 | ) |  |  | 118.20 |
Unvested at December 31, 2021 |  |  | 1,290,232 |  |  | $ | 110.83 |
Granted |  |  | 317,751 |  |  |  | 189.66 |
Vested |  |  | (427,942 | ) |  |  | 118.00 |
Forfeited |  |  | (38,704 | ) |  |  | 138.94 |
Unvested at December 31, 2022 |  |  | 1,141,337 |  |  | $ | 129.75 |
Granted |  |  | 277,234 |  |  |  | 180.00 |
Vested |  |  | (443,883 | ) |  |  | 125.36 |
Forfeited |  |  | (38,196 | ) |  |  | 143.45 |
Unvested at December 31, 2023 |  |  | 936,492 |  |  | $ | 147.02 |
Schedule of Nonvested Performance-Based Units Activity [Table Text Block] |
Performance Share Units |  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested at December 31, 2020 |  |  | 333,925 |  |  | $ | 109.57 |
Granted |  |  | 135,500 |  |  |  | 143.32 |
Vested |  |  | (95,415 | ) |  |  | 103.21 |
Forfeited |  |  | - |  |  |  | - |
Unvested at December 31, 2021 |  |  | 374,010 |  |  | $ | 123.42 |
Granted |  |  | 135,842 |  |  |  | 189.05 |
Vested |  |  | (108,823 | ) |  |  | 117.57 |
Forfeited |  |  | - |  |  |  | - |
Unvested at December 31, 2022 |  |  | 401,029 |  |  | $ | 146.96 |
Granted |  |  | 150,051 |  |  |  | 174.23 |
Vested |  |  | (142,346 | ) |  |  | 127.36 |
Forfeited |  |  | (22,011 | ) |  |  | 170.87 |
Unvested at December 31, 2023 |  |  | 386,723 |  |  | $ | 163.87 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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