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Inventories (Tables)
6 Months Ended
Jan. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block] Inventories consist of the following:

   January 31,
2020
   July 31,
2019
 
Raw materials  $873   $876 
Work in process   2,539    2,566 
Finished products   4,090    4,400 
   $7,502   $7,842