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Inventory (Tables)
9 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consist of the following components:

June 30,September 30,
20202019
Raw materials$3,937  $4,104  
Work in process6,713  6,301  
Finished goods1,376  1,861  
Parts and supplies13,317  9,277  
Total inventories$25,343  $21,543