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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