Business Segments (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 Segment	Mar. 31, 2012
Business Segments [Abstract]
Number of business segments	2
Business segment information [Abstract]
Net sales	$ 6,447,000	$ 6,162,000
Income (Loss) before income tax provision [Abstract]
Interest expense	(17,000)	(34,000)
Investment and other income, net	3,000	93,000
Loss before income tax provision	(54,000)	(1,345,000)
Electronics Group [Member]
Business segment information [Abstract]
Net sales	3,188,000	3,106,000
Income (Loss) before income tax provision [Abstract]
Loss before income tax provision	(467,000)	(1,733,000)
Power Group [Member]
Business segment information [Abstract]
Net sales	3,272,000	3,056,000
Income (Loss) before income tax provision [Abstract]
Loss before income tax provision	734,000	646,000
Intersegment [Member]
Business segment information [Abstract]
Net sales	(13,000)	0
General Corporate Not Allocated [Member]
Income (Loss) before income tax provision [Abstract]
Loss before income tax provision	(307,000)	(317,000)
Domestic [Member] | Electronics Group [Member]
Business segment information [Abstract]
Net sales	2,837,000	2,640,000
Domestic [Member] | Power Group [Member]
Business segment information [Abstract]
Net sales	3,072,000	2,705,000
Foreign [Member] | Electronics Group [Member]
Business segment information [Abstract]
Net sales	351,000	466,000
Foreign [Member] | Power Group [Member]
Business segment information [Abstract]
Net sales	$ 200,000	$ 351,000