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Inventories (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Inventories    
Raw materials $ 16,422,000 $ 17,485,000
Work in process 20,534,000 20,410,000
Finished goods 2,239,000 2,257,000
Inventories, total 39,195,000 40,152,000
Inventory reserve 12,100,000 12,000,000
Excess and obsolete inventory $ 86,000 $ 254,000