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Note 12 - Employee Retention Tax Credit (Details Textual) - USD ($)	3 Months Ended		6 Months Ended	9 Months Ended
	Jul. 31, 2021	Apr. 30, 2021	Jul. 31, 2021	Jul. 31, 2021
Employee Retention Tax Credit	$ 964,550	$ 3,375,815	$ 4,340,365
Employee Retention Tax Credit Used to Offset Payroll Taxes	710,303
Other Receivables [Member]
Employee Retention Tax Credit Receivable	3,630,062		$ 3,630,062	$ 3,630,062
Nonoperating Income (Expense) [Member]
Employee Retention Tax Credit	$ 964,550			$ 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

- Definition

Represents employee retention tax credit used to offset payroll taxes.

+ References

No definition available.

+ Details

Name:	occ_EmployeeRetentionTaxCreditUsedToOffsetPayrollTaxes
Namespace Prefix:	occ_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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: