Note 12 - Income Taxes - Schedule of Components of Provision of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal, Current income tax provision
State, Current income tax provision	44	64	58
Foreign, Current income tax provision	940	1,301	1,708
Total, Current income tax provision	984	1,365	1,766
Federal, Deferred income tax benefit
State, Deferred income tax benefit
Foreign, Deferred income tax benefit	(398)	(358)	(362)
Total, Deferred income tax benefit	(398)	(358)	(362)
Provision for income taxes	$ 586	$ 1,007	$ 1,404