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Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
6 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Balance at beginning of period $ 130,000 $ 100,000
Liabilities accrued for warranties issued during the period 80,506 185,083
Warranty claims and costs paid during the period (78,682) (106,415)
Changes in liability for pre-existing warranties during the period (56,824) (28,668)
Balance at end of period $ 75,000 $ 150,000