Note 3 - Revenue - Disaggregation of Revenue by Product Group and Sales Channel (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 492,412	$ 548,184
Sales Channel, Directly to Consumer [Member]
Net sales	356,613	398,659
Sales Channel, Through Intermediary [Member]
Net sales	135,799	149,525
North America [Member]
Net sales	256,044	271,691
Europe [Member]
Net sales	81,622	89,290
Asia [Member]
Net sales	154,746	187,203
Connectivity Solutions [Member]
Net sales	172,348	186,724
Connectivity Solutions [Member] | Sales Channel, Directly to Consumer [Member]
Net sales	113,115	120,333
Connectivity Solutions [Member] | Sales Channel, Through Intermediary [Member]
Net sales	59,233	66,391
Connectivity Solutions [Member] | North America [Member]
Net sales	128,096	135,454
Connectivity Solutions [Member] | Europe [Member]
Net sales	33,099	34,130
Connectivity Solutions [Member] | Asia [Member]
Net sales	11,153	17,140
Power Solutions and Protection [Member]
Net sales	163,528	176,053
Power Solutions and Protection [Member] | Sales Channel, Directly to Consumer [Member]
Net sales	110,587	120,787
Power Solutions and Protection [Member] | Sales Channel, Through Intermediary [Member]
Net sales	52,941	55,266
Power Solutions and Protection [Member] | North America [Member]
Net sales	93,540	98,432
Power Solutions and Protection [Member] | Europe [Member]
Net sales	41,016	45,556
Power Solutions and Protection [Member] | Asia [Member]
Net sales	28,972	32,065
Magnetic Solutions [Member]
Net sales	156,536	185,407
Magnetic Solutions [Member] | Sales Channel, Directly to Consumer [Member]
Net sales	132,911	157,539
Magnetic Solutions [Member] | Sales Channel, Through Intermediary [Member]
Net sales	23,625	27,868
Magnetic Solutions [Member] | North America [Member]
Net sales	34,408	37,805
Magnetic Solutions [Member] | Europe [Member]
Net sales	7,507	9,604
Magnetic Solutions [Member] | Asia [Member]
Net sales	$ 114,621	$ 137,998