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Inventories (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Components of Inventories [Abstract]    
Raw materials $ 7,299,000 $ 8,199,000
Work-in-process 5,026,000 4,742,000
Finished goods 378,000 330,000
TOTAL $ 12,703,000 $ 13,271,000