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Inventories (Tables)
 9 Months Ended
Apr. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
 
April 30,
2017
 
July 31,
2016
Raw materials, containers and supplies
$
360

 
$
391

Finished products
431

 
549

 
$
791

 
$
940