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Note 6 - Product Warranties (Details Textual) - USD ($)
12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Standard and Extended Product Warranty Accrual, Ending Balance $ 75,000 $ 85,000 $ 120,000
Product Warranty Expense 55,592 67,150 $ 158,426
Accounts Payable and Accrued Liabilities [Member]      
Standard and Extended Product Warranty Accrual, Ending Balance $ 75,000 $ 85,000