Note 11 - Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Net income	$ 95,174	$ 77,651	$ 274,269	$ 224,607
Basic weighted-average number of common shares outstanding (in shares)	66,499,705	68,727,390	66,832,009	69,692,964
Dilutive effect of weighted-average outstanding common share equivalents RSUs (in shares)	261,692	263,258	299,361	253,913
Diluted weighted-average number of common shares outstanding (in shares)	66,761,397	68,990,648	67,131,370	69,946,877
Average restricted stock units with anti-dilutive effect (in shares)	0	546	2,118	16,387
Basic (in dollars per share)	$ 1.43	$ 1.13	$ 4.1	$ 3.22
Diluted (in dollars per share)	$ 1.43	$ 1.13	$ 4.09	$ 3.21