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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Apr. 30, 2020
Accounting Policies [Abstract]  
Warranty Accrual

Following is a tabular reconciliation of the changes in the warranty accrual for the six-month period ended April 30:

 

    2020   2019
Beginning balance   $ 60,000     $ 80,000  
Warranty service provided     (71,803 )     (59,243 )
New product warranties     27,101       38,587  
Changes to pre-existing warranty accruals     34,702       10,656  
Ending balance   $ 50,000     $ 70,000