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Note 6 - Product Warranties (Details Textual) - USD ($)
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Standard and Extended Product Warranty Accrual, Ending Balance $ 180,000 $ 180,000 $ 70,000
Product Warranty Expense 219,190 281,523 $ 70,691
Accounts Payable and Accrued Liabilities [Member]      
Standard and Extended Product Warranty Accrual, Ending Balance $ 180,000 $ 180,000