Inventories (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Inventories [Abstract]
Raw materials	$ 2,098,000	$ 1,927,000
Work-in-process	596,000	1,569,000
Finished goods	6,745,000	6,787,000
Less: allowance for obsolescence	(696,000)	(696,000)
Total	8,743,000	9,587,000
Business acquisition step up in value of inventories	1,900,000
unamortized amount related to step-up in the value of inventories	$ 200,000