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Note 16 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income tax benefit at federal statutory rate of 35%	$ (3,322)	$ (3,755)	$ (9,133)
State benefit, net of federal income tax effect	(472)	(286)	(440)
Federal and state income tax credits	36	(154)	(5,060)
Disallowed domestic manufacturing deduction			630
Change in valuation allowance	1,570	585	2,059
Excess income tax shortfall on share-based compensation	765
Effect of Tax Cuts and Jobs Act of 2017	874
Uncertain income tax positions	(562)	(4)	1,275
Goodwill impairment (nondeductible)			1,849
Nondeductible expenses	63	63	91
Nontaxable adjustment to contingent consideration		(580)	103
Other	(52)	33	103
Income tax benefit	$ (1,100)	$ (4,098)	$ (8,523)
Effective income tax rate	(11.60%)	(37.80%)	(32.40%)

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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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