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Note 2 - Allowance for Doubtful Accounts for Trade Accounts Receivable | 12 Months Ended
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Oct. 31, 2020
Notes to Financial Statements |
Allowance for Doubtful Accounts for Trade Accounts Receivable Disclosure [Text Block] |
(2) | Allowance for Doubtful Accounts for Trade Accounts Receivable
| A summary of changes in the allowance for doubtful accounts for trade accounts receivable for the years ended October 31, 2020, 2019 and 2018 follows:
|  | 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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- Definition Allowance for doubtful accounts for trade accounts receivable + References No definition available. + Details
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Namespace Prefix: | occ_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration