Note 13 - Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income taxes at the federal statutory rate		$ 83,540	$ 97,032	$ 106,959
Income taxes at the federal statutory rate		21.00%	21.00%	21.00%
State income taxes, net of federal benefit	[1]	$ 10,030	$ 14,120	$ 12,708
State income taxes, net of federal benefit	[1]	2.50%	3.10%	2.50%
Tax effect of permanent differences		$ (1,212)	$ 1,357	$ (488)
Tax effect of permanent differences		(0.30%)	0.30%	(0.10%)
Foreign tax rate differential		$ 271	$ 266	$ (2,134)
Foreign tax rate differential		0.10%	0.00%	(0.40%)
Other, net		$ 216	$ 1,225	$ 197
Other, net		0.00%	0.30%	0.00%
Provision for income taxes		$ 92,845	$ 114,000	$ 117,242
Provision for income taxes		23.30%	24.70%	23.00%

[1] State taxes in Texas, California and Illinois made up the majority (greater than 50 percent) of the tax effect in this category