Note 12 - Segments - Net Sales to External Customers by Geographic Area and by Major Product Line (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 492,412	$ 548,184
Connectivity Solutions [Member]
Net sales	172,348	186,724
Magnetic Solutions [Member]
Net sales	156,536	185,407
Power Solutions and Protection [Member]
Net sales	163,528	176,053
UNITED STATES
Net sales	256,044	271,691
MACAU
Net sales	154,745	187,204
UNITED KINGDOM
Net sales	24,877	26,340
SLOVAKIA
Net sales	22,705	24,123
GERMANY
Net sales	14,855	15,298
SWITZERLAND
Net sales	10,654	13,279
All Other Foreign Countries [Member]
Net sales	$ 8,532	$ 10,249