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Note 7 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income tax at federal statutory rate	$ 209,952	$ 139,865	$ 142,988
State tax, net of federal effect	37,223	20,071	19,293
Benefit of stock compensation	(7,583)	(3,503)	(1,238)
199/R&D credit	(1,524)	0	(200)
Nondeductible meals and entertainment	130	1,344	1,688
Change in effective state tax rate, net of federal benefit	(724)	98	1,562
Other, net	1,492	2,115	482
Total tax expense/(benefit)	$ 238,966	$ 159,990	$ 164,575

X

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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