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Note 15 - Shareholders' Equity - Share Repurchases (Details) - USD ($)	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Shares repurchased (in shares)	0	351	272
Cost	$ 0	$ 1,573	$ 1,557

X

- Definition

Represents the repurchase and retirement of common stock (at cost).

+ References

No definition available.

+ Details

Name:	occ_RepurchaseAndRetirementOfCommonStockAtCost
Namespace Prefix:	occ_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the repurchase and retirement of common stock shares.

+ References

No definition available.

+ Details

Name:	occ_RepurchaseAndRetirementOfCommonStockShares
Namespace Prefix:	occ_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration