Business Segments (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Segment	Jun. 30, 2013
Business Segments [Abstract]
Number of business segments			2
Business segment information [Abstract]
Net sales	$ 5,396,000	$ 6,475,000	$ 10,403,000	$ 12,922,000
Income (Loss) before income tax provision:
Income (loss) before income tax provision	(160,000)	129,000	(1,204,000)	75,000
Interest expense	(10,000)	(15,000)	(21,000)	(32,000)
Investment and other income (expense), net	(3,000)	2,000	7,000	5,000
General Corporate Not Allocated [Member]
Income (Loss) before income tax provision:
Income (loss) before income tax provision	(255,000)	(302,000)	(554,000)	(609,000)
Reportable Segments [Member] | Electronics Group [Member]
Business segment information [Abstract]
Net sales	2,664,000	3,316,000	5,568,000	6,504,000
Income (Loss) before income tax provision:
Income (loss) before income tax provision	(333,000)	(113,000)	(1,076,000)	(580,000)
Reportable Segments [Member] | Power Group [Member]
Business segment information [Abstract]
Net sales	2,732,000	3,166,000	4,835,000	6,438,000
Income (Loss) before income tax provision:
Income (loss) before income tax provision	441,000	557,000	440,000	1,291,000
Intersegment sales [Member]
Business segment information [Abstract]
Net sales	0	(7,000)	0	(20,000)
Domestic [Member] | Reportable Segments [Member] | Electronics Group [Member]
Business segment information [Abstract]
Net sales	2,412,000	3,172,000	5,179,000	6,009,000
Domestic [Member] | Reportable Segments [Member] | Power Group [Member]
Business segment information [Abstract]
Net sales	2,679,000	2,835,000	4,732,000	5,907,000
Foreign [Member] | Reportable Segments [Member] | Electronics Group [Member]
Business segment information [Abstract]
Net sales	252,000	144,000	389,000	495,000
Foreign [Member] | Reportable Segments [Member] | Power Group [Member]
Business segment information [Abstract]
Net sales	$ 53,000	$ 331,000	$ 103,000	$ 531,000