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Note 5 - Product Warranties (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Oct. 31, 2017
Oct. 31, 2016
Standard and Extended Product Warranty Accrual, Ending Balance $ 165,000 $ 155,000 $ 165,000 $ 155,000 $ 180,000 $ 70,000
Product Warranty Expense 8,196 $ 96,927 142,377 $ 178,565    
Accounts Payable and Accrued Liabilities [Member]            
Standard and Extended Product Warranty Accrual, Ending Balance $ 165,000   $ 165,000   $ 180,000