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Note 5 - Product Warranties (Details Textual) - USD ($)
3 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Oct. 31, 2021
Oct. 31, 2020
Standard and Extended Product Warranty Accrual, Ending Balance $ 75,000 $ 85,000 $ 75,000 $ 85,000
Product Warranty Expense 7,894 $ 18,348    
Accounts Payable and Accrued Liabilities [Member]        
Standard and Extended Product Warranty Accrual, Ending Balance $ 75,000