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Note 2 - Allowance for Doubtful Accounts for Trade Accounts Receivable (Tables) | 12 Months Ended
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Oct. 31, 2020
Notes Tables |
Summary of Changes in the Allowance for Doubtful Accounts for Trade Accounts Receivable [Table Text Block] |
|  | Years ended October 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Balance at beginning of year |  | $ | 99,562 |  |  | $ | 64,242 |  |  | $ | 87,446 |
Bad debt expense (recovery) |  |  | 425,055 |  |  |  | 60,381 |  |  |  | (18,455 | )
Losses charged to allowance |  |  | — |  |  |  | (25,061 | ) |  |  | (4,749 | )
Balance at end of year |  | $ | 524,617 |  |  | $ | 99,562 |  |  | $ | 64,242 |

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