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Note 12 - Income Taxes - Income Tax (Provision) for Federal Statutory Corporate Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Tax benefit (provision) at federal statutory rate	$ 2,152	$ 5,403
State income tax benefit (provision), net of federal benefit	413	439
Research and development tax credits	250	411
Subpart F inclusion		(370)
Foreign earnings or losses taxed at different rates	12	(540)
Tax rate change	23	(3,161)
Other	628	372
Change in valuation allowance	(9,918)	(833)
Tax benefit (provision)	$ (6,440)	$ 1,721

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

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