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Note 7 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income tax at federal statutory rate	$ 139,865	$ 142,988	$ 134,572
State tax, net of federal effect	20,071	19,293	24,627
Federal tax reform	0	0	(3,219)
Benefit of stock compensation	(3,503)	(1,238)	(4,919)
199/R&D credit	0	(200)	1,000
Nondeductible meals and entertainment	1,344	1,688	1,071
Change in effective state tax rate, net of federal benefit	98	1,562	(1,469)
Other, net	2,115	482	(430)
Total tax expense/(benefit)	$ 159,990	$ 164,575	$ 151,233

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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