Note 3 - Revenue - Disaggregation of Revenue by Product Group and Sales Channel (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net sales	$ 465,771	$ 492,412
Sales Channel, Directly to Consumer [Member]
Net sales	318,150	356,613
Sales Channel, Through Intermediary [Member]
Net sales	147,621	135,799
Connectivity Solutions [Member]
Net sales	150,731	172,348
Connectivity Solutions [Member] | Sales Channel, Directly to Consumer [Member]
Net sales	95,853	113,115
Connectivity Solutions [Member] | Sales Channel, Through Intermediary [Member]
Net sales	54,878	59,233
Power Solutions and Protection [Member]
Net sales	181,488	163,528
Power Solutions and Protection [Member] | Sales Channel, Directly to Consumer [Member]
Net sales	113,570	110,587
Power Solutions and Protection [Member] | Sales Channel, Through Intermediary [Member]
Net sales	67,918	52,941
Magnetic Solutions [Member]
Net sales	133,552	156,536
Magnetic Solutions [Member] | Sales Channel, Directly to Consumer [Member]
Net sales	108,727	132,911
Magnetic Solutions [Member] | Sales Channel, Through Intermediary [Member]
Net sales	24,825	23,625
North America [Member]
Net sales	265,676	256,044
North America [Member] | Connectivity Solutions [Member]
Net sales	112,663	128,096
North America [Member] | Power Solutions and Protection [Member]
Net sales	123,014	93,540
North America [Member] | Magnetic Solutions [Member]
Net sales	29,999	34,408
Europe [Member]
Net sales	70,792	81,622
Europe [Member] | Connectivity Solutions [Member]
Net sales	30,017	33,099
Europe [Member] | Power Solutions and Protection [Member]
Net sales	34,447	41,016
Europe [Member] | Magnetic Solutions [Member]
Net sales	6,328	7,507
Asia [Member]
Net sales	129,303	154,746
Asia [Member] | Connectivity Solutions [Member]
Net sales	8,051	11,153
Asia [Member] | Power Solutions and Protection [Member]
Net sales	24,027	28,972
Asia [Member] | Magnetic Solutions [Member]
Net sales	$ 97,225	$ 114,621