Inventories (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Inventories [Abstract]
Raw materials	$ 1,786,000	$ 1,244,000
Work-in-process	1,289,000	643,000
Finished goods	5,273,000	2,831,000
Deferred costs	377,000	677,000
Less: allowance for obsolescence	(696,000)
Total	8,029,000	5,395,000
Business acquisition step up in value of inventories	$ 1,900,000