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Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
9 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Balance at beginning of period $ 70,000 $ 130,000
Liabilities accrued for warranties issued during the period 176,113 117,437
Warranty claims and costs paid during the period (93,565) (112,724)
Changes in liability for pre-existing warranties during the period 2,452 (59,713)
Balance at end of period $ 155,000 $ 75,000