Geographic Segment Data (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Sales To Outside Customers	$ 13,034,000	$ 11,816,000	$ 26,379,000	$ 25,624,000
Total Assets	36,819,000		36,819,000		37,747,000
United States [Member]
Sales To Outside Customers	9,789,000	8,556,000	19,660,000	18,546,000
Total Assets	26,646,000		26,646,000		27,708,000
United Kingdom [Member]
Sales To Outside Customers	438,000	382,000	1,084,000	1,116,000
Total Assets	1,049,000		1,049,000		1,133,000
Europe [Member]
Sales To Outside Customers	185,000	194,000	427,000	315,000
Total Assets	1,027,000		1,027,000		1,057,000
Mexico [Member]
Sales To Outside Customers	2,622,000	2,684,000	5,208,000	5,647,000
Total Assets	$ 8,097,000		$ 8,097,000		$ 7,849,000