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Inventories (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Inventories    
Raw materials $ 17,485,000 $ 19,532,000
Work in process 20,410,000 16,007,000
Finished goods 2,257,000 2,473,000
Inventories, total 40,152,000 38,012,000
Inventory reserve 12,000,000 12,000,000
Excess and obsolete inventory $ 254,000 $ 625,000