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Inventories (Tables)
9 Months Ended
Apr. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory current
   April 30,
2020
   July 31,
2019
 
Raw materials  $907   $876 
Work in process   2,652    2,566 
Finished products   4,459    4,400 
   $8,018   $7,842