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Note 5 - Product Warranties (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2022
Jul. 31, 2021
Oct. 31, 2021
Oct. 31, 2020
Standard and Extended Product Warranty Accrual, Ending Balance $ 75,000 $ 95,000 $ 75,000 $ 95,000 $ 75,000 $ 85,000
Product Warranty Expense 24,071 $ 4,443 47,606 $ 60,714    
Accounts Payable and Accrued Liabilities [Member]            
Standard and Extended Product Warranty Accrual, Ending Balance $ 75,000   $ 75,000