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Inventories (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Inventories [Abstract]    
Raw materials $ 1,613,000 $ 1,384,000
Work in process 657,000 404,000
Finished goods 1,376,000 1,387,000
Inventory, net $ 3,646,000 $ 3,175,000