Note 13 - Stockholders' Equity and Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net income	$ 360,642	$ 298,304	$ 228,860
Basic EPS, income	$ 360,642	$ 298,304	$ 228,860
Basic EPS, income (in shares)	74,337,265	78,268,369	79,584,560
Basic EPS, income (in dollars per share)	$ 4.85	$ 3.81	$ 2.88
Effect of dilutive stock options and RSU (in shares)	327,470	302,269	193,287
Diluted EPS, income	$ 360,642	$ 298,304	$ 228,860
Diluted EPS, income (in shares)	74,664,735	78,570,638	79,777,847
Diluted EPS, income (in dollars per share)	$ 4.83	$ 3.80	$ 2.87