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Inventories (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Inventories    
Raw materials $ 26,966,000 $ 23,554,000
Work in process 28,217,000 20,135,000
Finished goods 3,388,000 2,151,000
Inventories, Total 58,571,000 45,840,000
Inventory reserve 14,800,000 13,300,000
Excess and obsolete inventory $ 18,000 $ 291,000