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Inventory (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Inventory Disclosure [Abstract]    
Raw materials $ 19,108,000 $ 20,364,000
Work in process 7,621,000 6,601,000
Inventory, Net 26,729,000 26,965,000
Allowance for inventory obsolescence $ 770,808 $ 485,680