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Inventories (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Inventories [Abstract]    
Raw materials $ 1,603,000 $ 1,715,000
Work in process 1,293,000 1,301,000
Finished goods 1,716,000 1,813,000
Inventory, net $ 4,612,000 $ 4,829,000