Property, Plant and Equipment (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Property, plant and equipment
Property, plant and equipment, gross	$ 23,593,000		$ 23,593,000		$ 21,482,000
Less accumulated depreciation	(13,944,000)		(13,944,000)		(12,851,000)
Property, plant and equipment, net	9,649,000		9,649,000		8,631,000
Depreciation expense	395,000	255,000	1,059,000	895,000
Land
Property, plant and equipment
Property, plant and equipment, gross	290,000		290,000		290,000
Building and improvements
Property, plant and equipment
Property, plant and equipment, gross	3,961,000		3,961,000		3,713,000
Machinery, equipment, tools and dies
Property, plant and equipment
Property, plant and equipment, gross	15,183,000		15,183,000		13,483,000
Furniture, fixtures and other
Property, plant and equipment
Property, plant and equipment, gross	$ 4,159,000		$ 4,159,000		$ 3,996,000