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Note 9 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Computed "expected" income tax expense	$ 8,154	$ 9,527	$ 22,368
State income taxes, net of federal income tax effect	862	953	2,237
Per diem allowances	2,145	2,205	2,329
Tax contingency accruals	(43)	(273)	1,599
Valuation allowance, net	1,167		(218)
Tax credits	(1,084)	(694)	(7,151)
Impact of Tax Cuts and Jobs Act remeasurement	(40,123)
Excess tax benefits on share-based compensation	(457)
Other, net	(429)	(1,332)	222
Actual income tax expense	$ (32,142)	$ 10,386	$ 21,822

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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