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Inventories and major vendors - Components of Inventories (Detail) - USD ($)
$ in Thousands
Jul. 31, 2019
Oct. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 3,538 $ 2,711
Work in process 743 603
Finished goods 3,805 3,799
Totals $ 8,086 $ 7,113