Note 8 - Income Taxes - The Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 4,262	$ 2,451	$ 4,409
State	673	292	393
Foreign	2,718	886	710
	7,653	3,629	5,512
Deferred:
Federal	(1,512)	(268)	197
State	(145)	390	166
Foreign	(495)	178	(223)
	(2,152)	300	140
Provision for income taxes	$ 5,501	$ 3,929	$ 5,652