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Inventories (Tables)
3 Months Ended
Oct. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block] Inventories consist of the following:

   October 31,
2019
   July 31,
2019
 
Raw materials  $905   $876 
Work in process   2,574    2,566 
Finished products   4,089    4,400 
   $7,568   $7,842