Operating Segments - Reconciliation of Segment Financial Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Net sales		$ 7,691
Operating income (loss)	(652)	(368)
Total assets	27,766		26,459
Electronic Devices [Member]
Net sales	5,162
Operating income (loss)	180
Total assets	19,356
Communications Equipment [Member]
Total assets	6,183		6,266
Communications Equipment [Member]
Net sales	2,595	2,182
Operating income (loss)	23	(256)
Corporate And Other [Member]
Operating income (loss)	(855)	(737)
Total assets	2,227		59
Electronic Devices [Member]
Net sales		5,509
Operating income (loss)		625
Total assets			$ 20,134