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Note 5 - Product Warranties (Details Textual) - USD ($)
3 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Oct. 31, 2017
Oct. 31, 2016
Standard and Extended Product Warranty Accrual $ 140,000 $ 85,000 $ 180,000 $ 70,000
Product Warranty Expense 41,996 $ 47,855    
Accounts Payable and Accrued Liabilities [Member]        
Standard and Extended Product Warranty Accrual $ 140,000   $ 180,000