Note 14 - Segments - Segments (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
Gross Profit	$ 34,204	$ 31,290	$ 59,144	$ 57,045
Gross Profit %	24.70%	25.80%	23.70%	25.30%
Connectivity Solutions [Member]
Revenue	$ 43,046	$ 38,908	$ 81,102	$ 78,007
Gross Profit	$ 13,050	$ 11,531	$ 22,823	$ 22,698
Gross Profit %	30.30%	29.60%	28.10%	29.10%
Power Solutions and Protection Segment [Member]
Revenue	$ 55,390	$ 45,112	$ 99,031	$ 81,289
Gross Profit	$ 14,373	$ 10,615	$ 25,155	$ 19,523
Gross Profit %	25.90%	23.50%	25.40%	24.00%
Magnetic Solutions Segment [Member]
Revenue	$ 40,305	$ 37,152	$ 69,252	$ 65,853
Gross Profit	$ 9,343	$ 9,445	$ 13,304	$ 15,438
Gross Profit %	23.20%	25.40%	19.20%	23.40%
Corporate Segment [Member]
Revenue	$ 0	$ 0	$ 0	$ 0
Gross Profit	$ (2,562)	$ (301)	$ (2,138)	$ (614)