Note 12 - Segments - Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net sales	$ 465,771	$ 492,412
Gross Profit	$ 119,730	$ 109,973
Gross Profit %	25.70%	22.30%
Total Assets	$ 453,866	$ 468,917
Capital Expenditures	5,476	9,891
Depreciation and amortization	16,423	16,471
Connectivity Solutions [Member]
Net sales	150,731	172,348
Gross Profit	$ 42,200	$ 44,417
Gross Profit %	28.00%	25.80%
Total Assets	$ 137,333	$ 145,344
Capital Expenditures	1,955	2,934
Depreciation and amortization	5,700	6,021
Power Solutions and Protection Segment [Member]
Net sales	181,488	163,528
Gross Profit	$ 45,587	$ 32,846
Gross Profit %	25.10%	20.10%
Total Assets	$ 180,939	$ 168,422
Capital Expenditures	2,458	4,570
Depreciation and amortization	8,611	7,858
Magnetic Solutions Segment [Member]
Net sales	133,552	156,536
Gross Profit	$ 33,072	$ 34,350
Gross Profit %	24.80%	21.90%
Total Assets	$ 92,538	$ 89,463
Capital Expenditures	1,063	2,387
Depreciation and amortization	2,112	2,592
Corporate Segment [Member]
Net sales	0	0
Gross Profit	(1,129)	(1,640)
Total Assets	43,056	65,688
Capital Expenditures	0
Depreciation and amortization