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Summary of Significant Accounting Policies (Tables)
9 Months Ended
Jul. 31, 2020
Accounting Policies [Abstract]  
Warranty Accrual

Following is a tabular reconciliation of the changes in the warranty accrual for the nine-month period ended July 31:

 

    2020   2019
Beginning balance   $ 60,000     $ 80,000  
Warranty service provided     (86,686 )     (111,987 )
New product warranties     46,480       55,351  
Changes to pre-existing warranty accruals     20,206       46,636  
Ending balance   $ 40,000     $ 70,000