Note 8 - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current tax expense:
Federal	$ 1,208	$ 1,076	$ 806
State	48	95	80
Foreign	1,009	893	525
Total current expense	2,265	2,064	1,411
Deferred tax expense (benefit):
Federal	(508)	171	19
State	(15)	(27)	(3)
Foreign	(255)	(286)	(464)
Total deferred expense (benefit)	(778)	(142)	(448)
Provision for income taxes	$ 1,487	$ 1,922	$ 963