Note 5 - Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2025

Notes Tables

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Years ended December 31,
	2025		2024		2023
Restricted share units
Pretax compensation expense	$	55,177	$	49,172	$	56,837
Tax benefit		13,607		12,214		12,561
Restricted share units, net of tax	$	41,570	$	36,958	$	44,276
Performance share units
Pretax compensation expense	$	16,576	$	16,514	$	22,352
Tax benefit		4,088		4,102		4,940
Performance share awards, net of tax	$	12,488	$	12,412	$	17,412

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, 2024		737,237		$	163.83
Granted		344,140			162.66
Vested		(372,223	)		157.29
Forfeited		(24,147	)		181.65
Unvested at December 31, 2025		685,007		$	166.14

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, 2024		352,291		$	179.14
Granted		104,360			164.79
Vested		(84,001	)		172.53
Forfeited		(35,124	)		188.22
Unvested at December 31, 2025		337,526		$	175.40