Note 18 - Segment Reporting - Income From Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income from operations	$ 79,856	$ 88,898	$ 72,226
Operating Segments [Member] | United States Segment [Member]
Income from operations	108,594	115,710	99,561
Operating Segments [Member] | Europe Segment [Member]
Income from operations	15,077	16,747	12,796
Operating Segments [Member] | Corporate Unallocated and Japan Segment[Member]
Income from operations	$ (43,815)	$ (43,557)	$ (40,131)