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Note 8 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Computed "expected" income tax expense	$ 2,508	$ 12,182	$ 8,154
State income taxes, net of federal income tax effect	(351)	2,610	862
831(b) election	(393)	(200)	(290)
Per diem allowances	1,450	1,446	2,145
Tax contingency accruals	601	(57)	(43)
Valuation allowance, net	321		(1,167)
Tax credits	(377)	(968)	(1,352)
Impact of Tax Act remeasurement			(40,123)
Excess tax benefits on share-based compensation	105	50	(457)
Change in prior year estimates	(420)
Other, net	20	444	129
Income tax expense (benefit)	$ 3,464	$ 15,507	$ (32,142)

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to 831(b) election.

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