Note 15 - Segments - Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net sales	$ 124,479	$ 146,489	$ 377,284	$ 405,451
Income from operations	(4,623)	10,499	3,145	21,603
Intersegment Eliminations [Member]
Net sales	(27,033)	(30,849)	(89,121)	(87,147)
North America [Member]
Net sales	65,778	70,654	197,430	201,351
Income from operations	(8,406)	3,360	(6,526)	6,021
North America [Member] | Reportable Geographical Components [Member]
Net sales	68,190	73,932	205,113	211,105
Asia [Member]
Net sales	39,954	53,528	116,555	138,062
Income from operations	2,463	5,753	3,746	10,987
Asia [Member] | Reportable Geographical Components [Member]
Net sales	59,561	78,008	184,933	204,152
Europe [Member]
Net sales	18,747	22,307	63,299	66,038
Income from operations	1,320	1,386	5,925	4,595
Europe [Member] | Reportable Geographical Components [Member]
Net sales	$ 23,761	$ 25,398	$ 76,359	$ 77,341