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Inventories (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Inventories [Abstract]    
Raw materials $ 981,000 $ 1,009,000
Work in process 1,189,000 816,000
Finished goods 2,292,000 2,473,000
Inventory, net $ 4,462,000 $ 4,298,000