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Note 6 - Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Years ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Restricted share units |  |  |  |  |  |  |  |  |  |  |  |
Pretax compensation expense |  | $ | 44,505 |  |  | $ | 47,044 |  |  | $ | 38,632 |
Tax benefit |  |  | 10,637 |  |  |  | 11,300 |  |  |  | 9,337 |
Restricted share units, net of tax |  | $ | 33,868 |  |  | $ | 35,744 |  |  | $ | 29,295 |
Performance share units |  |  |  |  |  |  |  |  |  |  |  |
Pretax compensation expense |  | $ | 17,000 |  |  | $ | 13,654 |  |  | $ | 14,692 |
Tax benefit |  |  | 4,063 |  |  |  | 3,280 |  |  |  | 3,551 |
Performance share awards, net of tax |  | $ | 12,937 |  |  | $ | 10,374 |  |  | $ | 11,141 |
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, 2018 |  |  | 1,245,835 |  |  | $ | 86.80 |
Granted |  |  | 440,255 |  |  |  | 99.60 |
Vested |  |  | (341,218 | ) |  |  | 85.61 |
Forfeited |  |  | (31,454 | ) |  |  | 93.91 |
Unvested at December 31, 2019 |  |  | 1,313,418 |  |  | $ | 91.22 |
Granted |  |  | 511,859 |  |  |  | 110.49 |
Vested |  |  | (457,437 | ) |  |  | 93.78 |
Forfeited |  |  | (22,694 | ) |  |  | 102.03 |
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 |
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, 2018 |  |  | 360,512 |  |  | $ | 93.74 |
Granted |  |  | 142,156 |  |  |  | 98.58 |
Vested |  |  | (127,140 | ) |  |  | 93.46 |
Forfeited |  |  | - |  |  |  | - |
Unvested at December 31, 2019 |  |  | 375,528 |  |  | $ | 95.67 |
Granted |  |  | 202,023 |  |  |  | 112.87 |
Vested |  |  | (145,038 | ) |  |  | 89.75 |
Forfeited |  |  | (98,588 | ) |  |  | 110.19 |
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 |

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