| Note 6 - Prepaid Expenses and Other Current Assets (Tables) | 3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Jan. 31, 2022 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] | 
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- Definition Tabular disclosure of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer; the aggregate carrying amount of current assets, not separately presented elsewhere in the balance sheet; and other deferred costs. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- References No definition available. 
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