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Note 3 - Allowance for Doubtful Accounts for Trade Accounts Receivable - Summary of Changes in the Allowance for Doubtful Accounts for Trade Accounts Receivable (Details) - USD ($)
6 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Balance $ 74,266 $ 63,011
Bad debt expense 11,169 12,019
Losses charged to allowance (4,729)
Balance $ 80,706 $ 75,030