Note 18 - Supplemental Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Balance at beginning of period	$ 2,138	$ 1,887	$ 1,753
Bad debt expense	1,089	268	272
Net recoveries (write-offs)	(635)	(8)	(138)
Effect of foreign currency translation	(1)	(9)
Balance at end of period	$ 2,591	$ 2,138	$ 1,887