Note 3 - Revenue - Disaggregation of Revenue by Product Group and Sales Channel (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue	$ 124,492	$ 124,479	$ 349,642	$ 377,284
Sales Channel, Directly to Consumer [Member]
Revenue	84,381	91,344	236,868	274,007
Sales Channel, Through Intermediary [Member]
Revenue	40,111	33,135	112,774	103,277
Connectivity Solutions [Member]
Revenue	38,535	44,531	116,543	131,354
Connectivity Solutions [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	24,806	28,661	73,459	86,398
Connectivity Solutions [Member] | Sales Channel, Through Intermediary [Member]
Revenue	13,729	15,870	43,084	44,956
Power Solutions and Protection [Member]
Revenue	47,793	40,289	129,082	127,325
Power Solutions and Protection [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	29,648	28,025	78,119	85,954
Power Solutions and Protection [Member] | Sales Channel, Through Intermediary [Member]
Revenue	18,145	12,264	50,963	41,371
Magnetic Solutions [Member]
Revenue	38,164	39,659	104,017	118,605
Magnetic Solutions [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	29,927	34,658	85,290	101,655
Magnetic Solutions [Member] | Sales Channel, Through Intermediary [Member]
Revenue	8,237	5,001	18,727	16,950
North America [Member]
Revenue	68,814	65,778	192,081	197,430
North America [Member] | Connectivity Solutions [Member]
Revenue	28,933	33,929	86,244	97,273
North America [Member] | Power Solutions and Protection [Member]
Revenue	31,770	23,608	83,522	73,495
North America [Member] | Magnetic Solutions [Member]
Revenue	8,111	8,241	22,315	26,662
Europe [Member]
Revenue	18,144	18,747	55,459	63,299
Europe [Member] | Connectivity Solutions [Member]
Revenue	7,458	8,092	23,576	25,069
Europe [Member] | Power Solutions and Protection [Member]
Revenue	8,714	8,813	26,993	32,121
Europe [Member] | Magnetic Solutions [Member]
Revenue	1,972	1,842	4,890	6,109
Asia [Member]
Revenue	37,534	39,954	102,102	116,555
Asia [Member] | Connectivity Solutions [Member]
Revenue	2,144	2,510	6,723	9,012
Asia [Member] | Power Solutions and Protection [Member]
Revenue	7,309	7,868	18,567	21,709
Asia [Member] | Magnetic Solutions [Member]
Revenue	$ 28,081	$ 29,576	$ 76,812	$ 85,834