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Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
9 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Balance at beginning of period $ 130,000 $ 100,000
Liabilities accrued for warranties issued during the period 117,437 205,376
Warranty claims and costs paid during the period (112,724) (134,643)
Changes in liability for pre-existing warranties during the period (59,713) 24,267
Balance at end of period $ 75,000 $ 195,000