Note 5 - Share-based Compensation - Components of Share-based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Restricted Stock Units (RSUs) [Member]
Pretax compensation expense	$ 55,177	$ 49,172	$ 56,837
Tax benefit	13,607	12,214	12,561
Restricted share unit expense, net of tax	41,570	36,958	44,276
Performance Shares [Member]
Pretax compensation expense	16,576	16,514	22,352
Tax benefit	4,088	4,102	4,940
Restricted share unit expense, net of tax	$ 12,488	$ 12,412	$ 17,412