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Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Inventory Disclosure [Abstract]    
Raw Materials $ 3,382 $ 4,104
Work in Process 4,429 3,731
Finished Goods 1,530 1,692
Parts and Supplies 7,665 7,396
Inventory, Net $ 17,006 $ 16,923