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Inventories and major vendors - Components of Inventories (Details) - USD ($)
$ in Thousands
Jan. 31, 2020
Oct. 31, 2019
Inventories and major vendors    
Raw materials and supplies $ 3,949 $ 3,576
Work in process 489 791
Finished goods 3,952 3,878
Totals $ 8,390 $ 8,245