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Note 5 - Product Warranties (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Oct. 31, 2020
Oct. 31, 2019
Standard and Extended Product Warranty Accrual, Ending Balance $ 95,000 $ 110,000 $ 95,000 $ 110,000 $ 85,000 $ 120,000
Product Warranty Expense 4,443 $ 44,347 60,714 $ 55,736    
Accounts Payable and Accrued Liabilities [Member]            
Standard and Extended Product Warranty Accrual, Ending Balance $ 95,000   $ 95,000   $ 85,000