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Note 17 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income tax expense (benefit) at federal statutory rate	$ 6,854	$ 3,583	$ (3,322)
State expense (benefit), net of federal income tax effect	1,261	(218)	(472)
Federal and state income tax credits		(7)	36
Change in valuation allowance	(3,564)	(2,618)	1,570
Tax windfall on share-based compensation		(369)
Excess income tax shortfall on share-based compensation			765
Bargain purchase gain		(4,228)
Effect of Tax Cuts and Jobs Act of 2017			874
Uncertain income tax positions			(562)
Foreign rate differential	36	77
Other	151	528	11
Income tax expense (benefit)	$ 4,738	$ (3,252)	$ (1,100)
Effective income tax rate	14.50%	(19.10%)	(11.60%)

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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 bargain purchase gain (loss).

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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 the excess tax shortfall on stock based compensation.

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