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Note 9 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Computed "expected" income tax expense	$ 9,527	$ 22,368	$ 11,404
State income taxes, net of federal income tax effect	953	2,237	1,075
Per diem allowances	2,205	2,329	2,304
Tax contingency accruals	(273)	1,599	(104)
Valuation allowance, net		218	18
Tax credits	(694)	(7,151)	(112)
Other, net	(1,332)	222	189
	$ 10,386	$ 21,822	$ 14,774

X

- Definition

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

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