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Inventories (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Inventories [Abstract]    
Raw materials $ 1,280,000 $ 1,503,000
Work in process 761,000 790,000
Finished goods 1,067,000 1,025,000
Inventory, net $ 3,108,000 $ 3,318,000