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Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
InventoryDisclosureAbstract    
Raw Materials $ 4,104 $ 2,538
Work in Process 3,731 4,158
Finished Goods 1,692 1,558
Parts and Supplies 7,396 4,982
Inventory, Net, Total $ 16,923 $ 13,236