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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 ($)
9 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Balance $ 74,266 $ 63,011
Bad debt expense 6,161 23,074
Losses charged to allowance (4,729)
Recoveries added to allowance 129
Balance $ 75,827 $ 86,085