Note 3 - Revenue - Disaggregation of Revenue by Product Group and Sales Channel (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue	$ 138,741	$ 121,172	$ 249,385	$ 225,149
Sales Channel, Directly to Consumer [Member]
Revenue	92,647	81,515	167,109	152,486
Sales Channel, Through Intermediary [Member]
Revenue	46,094	39,657	82,276	72,663
Connectivity Solutions [Member]
Revenue	43,046	38,908	81,102	78,007
Connectivity Solutions [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	25,785	23,600	49,422	48,652
Connectivity Solutions [Member] | Sales Channel, Through Intermediary [Member]
Revenue	17,261	15,308	31,680	29,355
Power Solutions and Protection [Member]
Revenue	55,390	45,112	99,031	81,289
Power Solutions and Protection [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	34,116	26,894	60,605	48,471
Power Solutions and Protection [Member] | Sales Channel, Through Intermediary [Member]
Revenue	21,274	18,218	38,426	32,818
Magnetic Solutions [Member]
Revenue	40,305	37,152	69,252	65,853
Magnetic Solutions [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	32,746	31,021	57,082	55,363
Magnetic Solutions [Member] | Sales Channel, Through Intermediary [Member]
Revenue	7,559	6,131	12,170	10,490
North America [Member]
Revenue	80,643	63,734	147,039	123,266
North America [Member] | Connectivity Solutions [Member]
Revenue	33,182	27,608	62,724	57,310
North America [Member] | Power Solutions and Protection [Member]
Revenue	37,867	29,029	67,644	51,752
North America [Member] | Magnetic Solutions [Member]
Revenue	9,594	7,097	16,671	14,204
Europe [Member]
Revenue	19,467	19,038	37,422	37,315
Europe [Member] | Connectivity Solutions [Member]
Revenue	7,557	8,356	14,304	16,118
Europe [Member] | Power Solutions and Protection [Member]
Revenue	9,668	8,965	19,627	18,279
Europe [Member] | Magnetic Solutions [Member]
Revenue	2,242	1,717	3,491	2,918
Asia [Member]
Revenue	38,631	38,400	64,924	64,568
Asia [Member] | Connectivity Solutions [Member]
Revenue	2,307	2,944	4,074	4,579
Asia [Member] | Power Solutions and Protection [Member]
Revenue	7,855	7,118	11,760	11,258
Asia [Member] | Magnetic Solutions [Member]
Revenue	$ 28,469	$ 28,338	$ 49,090	$ 48,731