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Note 5 - Product Warranties (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2016
Apr. 30, 2015
Oct. 31, 2015
Oct. 31, 2014
Accounts Payable and Accrued Liabilities [Member]            
Standard and Extended Product Warranty Accrual $ 75,000   $ 75,000   $ 130,000  
Standard and Extended Product Warranty Accrual 75,000 $ 150,000 75,000 $ 150,000 $ 130,000 $ 100,000
Product Warranty Expense $ 10,952 $ 117,336 $ 23,682 $ 156,415