Operating Segments - Reconciliation of Segment Financial Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Net sales	$ 6,627	$ 8,235	$ 22,415	$ 24,374
Operating income (loss)	(122)	216	(415)	(550)
Total assets	24,024		24,024		24,398
Electronic Devices [Member]
Net sales	4,905	6,124	15,050	17,480
Operating income (loss)	679	942	1,666	2,289
Total assets	18,721		18,721		17,222
Communications Equipment [Member]
Net sales	1,722	2,111	7,365	6,894
Operating income (loss)	(232)	(72)	(166)	(550)
Total assets	5,136		5,136		7,018
Corporate And Other [Member]
Operating income (loss)	(569)	(654)	(1,915)	(2,289)
Total assets	$ 167		$ 167		$ 158