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Note 6 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
12 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Balance at beginning of year $ 100,000 $ 190,000
Liabilities accrued for warranties issued during the year 215,802 323,564
Warranty claims paid during the period (204,784) (310,525)
Changes in liability for pre-existing warranties during the year 18,982 (103,039)
Balance at end of year $ 130,000 $ 100,000