Note 14 - Segments - Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue	$ 146,966	$ 124,492	$ 396,351	$ 349,642
Gross Profit	$ 35,974	$ 33,309	$ 95,117	$ 90,356
Gross Profit %	24.50%	26.80%	24.00%	25.80%
Connectivity Solutions [Member]
Revenue	$ 40,344	$ 38,535	$ 121,446	$ 116,543
Gross Profit	$ 10,003	$ 11,219	$ 32,826	$ 33,950
Gross Profit %	24.80%	29.10%	27.00%	29.10%
Power Solutions and Protection Segment [Member]
Revenue	$ 60,281	$ 47,793	$ 159,312	$ 129,082
Gross Profit	$ 15,762	$ 11,552	$ 40,917	$ 31,085
Gross Profit %	26.10%	24.20%	25.70%	24.10%
Magnetic Solutions Segment [Member]
Revenue	$ 46,341	$ 38,164	$ 115,593	$ 104,017
Gross Profit	$ 10,722	$ 10,793	$ 24,026	$ 26,198
Gross Profit %	23.10%	28.30%	20.80%	25.20%
Corporate Segment [Member]
Revenue	$ 0	$ 0	$ 0	$ 0
Gross Profit	$ (513)	$ (255)	$ (2,652)	$ (877)