Note 11 - Net Income Per Share - Net Income Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2025	Sep. 30, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Net income	$ 179,766	$ 135,009	$ 135,052	$ 270,061	$ 449,827	$ 621,483	$ 1,592,058	$ 427,374
Basic (in shares)	47,898	47,887	47,851	47,869	47,879	48,035	48,599	47,610
Effect of dilutive securities (in shares)						274	236	1,161
Diluted (in shares)	48,042	48,019	48,006	48,012	48,022	48,309	48,835	48,771
Basic (in dollars per share)	$ 3.75	$ 2.82	$ 2.82	$ 5.64	$ 9.4	$ 12.94	$ 32.76	$ 8.98
Diluted (in dollars per share)	$ 3.74	$ 2.81	$ 2.81	$ 5.62	$ 9.37	$ 12.86	$ 32.6	$ 8.76