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Note 6 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Balance at beginning of year $ 70,000 $ 130,000
Liabilities accrued for warranties issued during the year 238,093 124,018
Warranty claims paid during the period (171,523) (130,691)
Changes in liability for pre-existing warranties during the year 43,430 (53,327)
Balance at end of year $ 180,000 $ 70,000