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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Tax benefit (provision) at federal statutory rate	$ 5,403	$ (1,318)	$ (3,587)
State income tax benefit (provision), net of federal benefit	439	(148)	(408)
Research and development tax credits	411	423	456
Subpart F inclusion	(370)
Foreign earnings or losses taxed at different rates	(540)	(292)	(231)
Tax rate change	(3,161)
Other	372	233	280
Change in valuation allowance	(833)	(332)	(285)
Tax benefit (provision)	$ 1,721	$ (1,434)	$ (3,775)

X

- Definition

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

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