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Note 5 - Product Warranties (Details Textual) - USD ($)
3 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Oct. 31, 2020
Oct. 31, 2019
Standard and Extended Product Warranty Accrual, Ending Balance $ 85,000 $ 70,000 $ 85,000 $ 120,000
Product Warranty Expense 18,348 $ 37,257    
Accounts Payable and Accrued Liabilities [Member]        
Standard and Extended Product Warranty Accrual, Ending Balance $ 85,000   $ 85,000