Annual report pursuant to Section 13 and 15(d)

Inventories (Tables)

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Inventories (Tables)
12 Months Ended
Jul. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block] Inventories consisted of the following at July 31:

    2018     2017  
Raw materials   $ 754     $ 852  
Work in process     2,174       1,905  
Finished products     4,350       4,290  
    $ 7,278     $ 7,047