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Note 5 - Product Warranties (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Oct. 31, 2018
Oct. 31, 2017
Standard and Extended Product Warranty Accrual, Ending Balance $ 160,000 $ 195,000 $ 160,000 $ 195,000 $ 180,000 $ 180,000
Product Warranty Expense 48,716 $ 92,185 156,554 $ 134,181    
Accounts Payable and Accrued Liabilities [Member]            
Standard and Extended Product Warranty Accrual, Ending Balance $ 160,000   $ 160,000   $ 180,000