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Note 6 - Product Warranties (Details Textual) - USD ($)
12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Standard and Extended Product Warranty Accrual $ 180,000 $ 70,000 $ 130,000
Product Warranty Expense 281,523 70,691 $ 234,784
Accounts Payable and Accrued Liabilities [Member]      
Standard and Extended Product Warranty Accrual $ 180,000 $ 70,000