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Note 17 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income tax expense (benefit) at federal statutory rate	$ 3,583	$ (3,322)	$ (3,755)
State benefit, net of federal income tax effect	(218)	(472)	(286)
Federal and state income tax credits	(7)	36	(154)
Change in valuation allowance	(2,618)	1,570	585
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)	(4)
Nondeductible expenses	427	63	63
Foreign rate differential	77
Nontaxable adjustment to contingent consideration			(580)
Other	101	(52)	33
Income tax benefit	$ (3,252)	$ (1,100)	$ (4,098)
Effective income tax rate	(19.10%)	(11.60%)	(37.80%)

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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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