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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, 2016
Jul. 31, 2015
Balance at beginning of period $ 63,011 $ 92,988
Bad debt expense (recovery) 23,074 (14,203)
Losses charged to allowance (6,820)
Balance at end of period $ 86,085 $ 71,965