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Inventories (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Inventories    
Raw materials $ 29,750,000 $ 23,554,000
Work in process 26,055,000 20,135,000
Finished goods 2,912,000 2,151,000
Inventories, total 58,717,000 45,840,000
Inventory reserve 14,400,000 13,300,000
Excess and obsolete inventory $ 40,000 $ 291,000