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Note 6 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
12 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Balance at beginning of year $ 130,000 $ 100,000
Liabilities accrued for warranties issued during the year 124,018 215,802
Warranty claims paid during the period (130,691) (204,784)
Changes in liability for pre-existing warranties during the year (53,327) 18,982
Balance at end of year $ 70,000 $ 130,000