Geographic Segment Data (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Sales to outside customers	$ 13,345,000	$ 13,807,000
Total Assets	38,142,000		37,747,000
United States [Member]
Sales to outside customers	9,871,000	9,990,000
Total Assets	27,598,000		27,708,000
United Kingdom [Member]
Sales to outside customers	646,000	733,000
Total Assets	1,126,000		1,133,000
Europe [Member]
Sales to outside customers	242,000	121,000
Total Assets	1,052,000		1,057,000
Mexico [Member]
Sales to outside customers	2,586,000	2,963,000
Total Assets	$ 8,366,000		$ 7,849,000