Note 12 - Employee Retention Tax Credit (Details Textual)	Apr. 30, 2021 USD ($)
Employee Tax Retention Credit	$ 3,375,815

The amount of refundable payroll tax credit receivable for qualifying businesses to keep employees on payroll during the COVID-19 pandemic.

No definition available.

Name:	occ_EmployeeTaxRetentionCredit
Namespace Prefix:	occ_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant