Business Segments (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Segment	Jun. 30, 2012
Business Segments [Abstract]
Number of business segments			2
Business segment information [Abstract]
Net sales	$ 6,475,000	$ 7,509,000	$ 12,922,000	$ 13,671,000
Income (Loss) before income tax provision [Abstract]
Interest expense	(15,000)	(36,000)	(32,000)	(70,000)
Investment and other income, net	2,000	4,000	5,000	97,000
Income (loss) before income tax provision	129,000	227,000	75,000	(1,118,000)
Electronics Group [Member]
Business segment information [Abstract]
Net sales	3,316,000	4,291,000	6,504,000	7,397,000
Income (Loss) before income tax provision [Abstract]
Income (loss) before income tax provision	(113,000)	(57,000)	(580,000)	(1,790,000)
Power Group [Member]
Business segment information [Abstract]
Net sales	3,166,000	3,218,000	6,438,000	6,274,000
Income (Loss) before income tax provision [Abstract]
Income (loss) before income tax provision	557,000	714,000	1,291,000	1,360,000
Intersegment [Member]
Business segment information [Abstract]
Net sales	(7,000)	0	(20,000)	0
General Corporate Not Allocated [Member]
Income (Loss) before income tax provision [Abstract]
Income (loss) before income tax provision	(302,000)	(398,000)	(609,000)	(715,000)
Domestic [Member] | Electronics Group [Member]
Business segment information [Abstract]
Net sales	3,172,000	3,795,000	6,009,000	6,435,000
Domestic [Member] | Power Group [Member]
Business segment information [Abstract]
Net sales	2,835,000	2,935,000	5,907,000	5,640,000
Foreign [Member] | Electronics Group [Member]
Business segment information [Abstract]
Net sales	144,000	496,000	495,000	962,000
Foreign [Member] | Power Group [Member]
Business segment information [Abstract]
Net sales	$ 331,000	$ 283,000	$ 531,000	$ 634,000