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Note 6 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Balance at beginning of year $ 180,000 $ 70,000
Liabilities accrued for warranties issued during the year 266,258 238,093
Warranty claims paid during the period (219,190) (171,523)
Changes in liability for pre-existing warranties during the year (47,068) 43,430
Balance at end of year $ 180,000 $ 180,000