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

   January 31,
2019
   July 31,
2018
 
Raw materials  $788   $754 
Work in process   2,315    2,174 
Finished products   4,411    4,350 
   $7,514   $7,278