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Inventories (Tables)
12 Months Ended
Jul. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block] Inventories consisted of the following at July 31:

   2019   2018 
Raw materials   $876   $754 
Work in process    2,566    2,174 
Finished products    4,400    4,350 
   $7,842   $7,278