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Note 5 - Product Warranties (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Oct. 31, 2019
Oct. 31, 2018
Standard and Extended Product Warranty Accrual, Ending Balance $ 110,000 $ 200,000 $ 110,000 $ 200,000 $ 120,000 $ 180,000
Product Warranty Expense 44,347 $ 69,075 55,736 $ 225,629    
Accounts Payable and Accrued Liabilities [Member]            
Standard and Extended Product Warranty Accrual, Ending Balance $ 110,000   $ 110,000   $ 120,000