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Note 5 - Product Warranties (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Oct. 31, 2018
Oct. 31, 2017
Standard and Extended Product Warranty Accrual, Ending Balance $ 200,000 $ 165,000 $ 200,000 $ 165,000 $ 180,000 $ 180,000
Product Warranty Expense 69,075 $ 8,196 225,629 $ 142,377    
Accounts Payable and Accrued Liabilities [Member]            
Standard and Extended Product Warranty Accrual, Ending Balance $ 200,000   $ 200,000   $ 180,000