Note 14 - Segments - Segments (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
Gross Profit	$ 33,534	$ 28,620	$ 90,415	$ 86,100
Gross Profit %	26.90%	23.00%	25.90%	22.80%
Connectivity Solutions [Member]
Revenue	$ 38,535	$ 44,531	$ 116,543	$ 131,354
Gross Profit	$ 11,219	$ 11,893	$ 33,950	$ 34,416
Gross Profit %	29.10%	26.70%	29.10%	26.20%
Power Solutions and Protection Segment [Member]
Revenue	$ 47,793	$ 40,289	$ 129,082	$ 127,325
Gross Profit	$ 11,552	$ 6,797	$ 31,085	$ 25,641
Gross Profit %	24.20%	16.90%	24.10%	20.10%
Magnetic Solutions Segment [Member]
Revenue	$ 38,164	$ 39,659	$ 104,017	$ 118,605
Gross Profit	$ 10,793	$ 10,245	$ 26,198	$ 26,890
Gross Profit %	28.30%	25.80%	25.20%	22.70%
Corporate Segment [Member]
Revenue	$ 0	$ 0	$ 0	$ 0
Gross Profit	$ (30)	$ (315)	$ (818)	$ (847)