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Note 5 - Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Years ended December 31, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
Restricted share units |  |  |  |  |  |  |  |  |  |  |  |
Pretax compensation expense |  | $ | 49,172 |  |  | $ | 56,837 |  |  | $ | 54,276 |
Tax benefit |  |  | 12,214 |  |  |  | 12,561 |  |  |  | 13,216 |
Restricted share units, net of tax |  | $ | 36,958 |  |  | $ | 44,276 |  |  | $ | 41,060 |
Performance share units |  |  |  |  |  |  |  |  |  |  |  |
Pretax compensation expense |  | $ | 16,514 |  |  | $ | 22,352 |  |  | $ | 23,259 |
Tax benefit |  |  | 4,102 |  |  |  | 4,940 |  |  |  | 5,664 |
Performance share awards, net of tax |  | $ | 12,412 |  |  | $ | 17,412 |  |  | $ | 17,595 |
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, 2023 |  |  | 936,492 |  |  | $ | 147.02 |
Granted |  |  | 269,322 |  |  |  | 192.98 |
Vested |  |  | (430,890 | ) |  |  | 146.06 |
Forfeited |  |  | (37,687 | ) |  |  | 171.81 |
Unvested at December 31, 2024 |  |  | 737,237 |  |  | $ | 163.83 |
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, 2023 |  |  | 386,723 |  |  | $ | 163.87 |
Granted |  |  | 140,469 |  |  |  | 195.24 |
Vested |  |  | (138,115 | ) |  |  | 150.73 |
Forfeited |  |  | (36,786 | ) |  |  | 186.85 |
Unvested at December 31, 2024 |  |  | 352,291 |  |  | $ | 179.14 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -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 performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -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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