Note 6 - Long-term Debt and Notes Payable (Details Textual) - USD ($)		3 Months Ended	6 Months Ended	12 Months Ended
Jul. 24, 2020	Apr. 30, 2024	Apr. 30, 2024	Oct. 31, 2023
Loans Payable, Noncurrent		$ 2,599,030	$ 2,599,030	$ 2,622,620
Revolving Credit Facility [Member] \| North Mill Capital LLC [Member]
Debt Instrument, Interest Rate, Effective Percentage	4.75%	10.00%	10.00%	10.00%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:PrimeRateMember	us-gaap:PrimeRateMember		us-gaap:PrimeRateMember
Line of Credit Facility, Percent of Eligible Accounts		85.00%	85.00%
Line of Credit Facility, Percent of Eligible Inventory		35.00%	35.00%
Line of Credit Facility, Additional Capacity for Advances		$ 5,000,000	$ 5,000,000
Line of Credit Facility, Maximum Percentage of Outstanding Eligible Accounts Loan Value		100.00%	100.00%
Line of Credit Facility, Restricted Capacity for Advances		$ 1,150,000	$ 1,150,000
Line of Credit Facility, Maximum Borrowing Capacity		18,000,000	$ 18,000,000
Debt Instrument, Basis Spread on Variable Rate			1.50%
Debt Instrument, Term Extensions	1 year
Long-Term Line of Credit		8,000,000	$ 8,000,000	$ 8,300,000
Line of Credit Facility, Remaining Borrowing Capacity		$ 2,000,000	$ 2,000,000	$ 2,600,000
Maximum [Member] \| Revolving Credit Facility [Member] \| North Mill Capital LLC [Member]
Debt Instrument, Interest Rate, Effective Percentage	6.00%
Virginia Real Estate Loan [Member]
Debt Instrument, Amortization Period			240 months
Debt Instrument, Interest Rate, Effective Percentage		8.50%	8.50%	8.50%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]		us-gaap:PrimeRateMember		us-gaap:PrimeRateMember
Loans Payable, Noncurrent		$ 2,700,000	$ 2,700,000	$ 2,700,000
Virginia Real Estate Loan [Member] \| Minimum [Member]
Debt Instrument, Interest Rate, Effective Percentage		8.50%	8.50%

Period for amortization of the debt instrument.

No definition available.

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- Definition

Potential extension to the period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Additional facility for advances.

+ References

No definition available.

+ Details

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Namespace Prefix:	occ_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percent of maximum outstanding eligible accounts loan value available for advance.

+ References

No definition available.

+ Details

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Namespace Prefix:	occ_
Data Type:	dtr-types:percentItemType
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Period Type:	instant

- Definition

Percent of aggregate outstanding amount of eligible accounts available for advance.

+ References

No definition available.

+ Details

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Namespace Prefix:	occ_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percent of aggregate outstanding amount of eligible inventory available for advance.

+ References

No definition available.

+ Details

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Namespace Prefix:	occ_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Additional limit to facility for advances.

+ References

No definition available.

+ Details

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Namespace Prefix:	occ_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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- Definition

Indicates type of variable interest rate on debt instrument.

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Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

+ Details

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Period Type:

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