Note 9 - Income Taxes - Schedule of Income Taxes on Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ (92)	$ 92
State	191	109	85
Foreign	2,516	930	601
Total current income tax	2,615	1,131	686
Deferred:
Foreign	(156)
Total deferred income tax	(156)
Income tax expense	$ 2,459	$ 1,131	$ 686