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Note 2 - Allowance for Doubtful Accounts for Trade Accounts Receivable (Tables) | 12 Months Ended
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Oct. 31, 2017
Notes Tables |
Summary of Changes in the Allowance for Doubtful Accounts for Trade Accounts Receivable [Table Text Block] |
|  | Years ended October 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Balance at beginning of year |  | $ | 74,266 |  |  | $ | 63,011 |  |  | $ | 92,988 |
Bad debt expense (recovery) |  |  | 21,569 |  |  |  | 11,255 |  |  |  | (16,889 | )
Losses charged to allowance |  |  | (8,389 | ) |  |  | — |  |  |  | (13,088 | )
Balance at end of year |  | $ | 87,446 |  |  | $ | 74,266 |  |  | $ | 63,011 |

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- References No definition available. + Details
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