Operating Segments - Reconciliation of Segment Financial Data (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Net sales	$ 34,047	$ 33,531
Gross profit	10,006	9,524
Depreciation and amortization	413	390
Operating income (loss)	(55)	(1,643)
Total assets	24,398	24,668
Electronic Devices [Member]
Net sales	24,036	22,022
Gross profit	7,085	5,859
Depreciation and amortization	237	223
Operating income (loss)	3,355	2,624
Total assets	17,222	16,188
Communications Equipment [Member]
Net sales	10,011	11,509
Gross profit	2,921	3,665
Depreciation and amortization	172	163
Operating income (loss)	(703)	(1,023)
Total assets	7,018	7,262
All Other [Member]
Depreciation and amortization	4	4
Corporate And Other [Member]
Operating income (loss)	(2,707)	(3,244)
Total assets	158	873
Discontinued And Held For Sale Assets [Member]
Total assets		$ 345