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Note 5 - Product Warranties (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
Oct. 31, 2016
Oct. 31, 2015
Standard and Extended Product Warranty Accrual $ 155,000 $ 75,000 $ 155,000 $ 75,000 $ 70,000 $ 130,000
Product Warranty Expense 96,927 $ 34,042 178,565 $ 57,724    
Accounts Payable and Accrued Liabilities [Member]            
Standard and Extended Product Warranty Accrual $ 155,000   $ 155,000   $ 70,000