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Note 16 - Employee Retention Tax Credit (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2021 | Apr. 30, 2021 | Jul. 31, 2021 | Oct. 31, 2021
Other Receivables [Member] |  |  |  |
Employee Retention Tax Credit Receivable |  |  |  | $ 2,162,391
Nonoperating Income (Expense) [Member] |  |  |  |
Employee Retention Tax Credit | $ 964,550 | $ 3,375,815 | $ 4,340,365 | $ 4,340,365

X
- Definition Amount of refundable payroll tax credit provided under the Coronavirus Aid, Relief, and Economic Security (CARES) Act. + References No definition available. + Details
Name: | occ_EmployeeRetentionTaxCredit
Namespace Prefix: | occ_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents employee retention tax credit receivable as of the balance sheet date. + References No definition available. + Details
Name: | occ_EmployeeRetentionTaxCreditReceivable
Namespace Prefix: | occ_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=occ_OtherReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_NonoperatingIncomeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |