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Patents (Tables)
12 Months Ended
Oct. 31, 2018
Statements Line Items  
Disclosure of detailed information about patents
    November 1,                          
    2016     Additions     October 31, 2017     Additions     October 31, 2018  
Cost $  621,181   $  161,647   $  782,828   $  121,603   $  904,431  
Accumulated amortization   217,581     133,785     351,366     156,960     508,326  
Net book value $  403,600         $  431,462         $  396,105