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Inventories (Tables)
 9 Months Ended
Apr. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block] Inventories consist of the following:

   April 30,
2017		   July 31,
2016		 
Raw materials   $939   $951 
Work in process    1,881    1,755 
Finished products    4,350    4,265 
   $7,170   $6,971