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Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
3 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Balance at beginning of period $ 130,000 $ 100,000
Liabilities accrued for warranties issued during the period 73,968 86,639
Warranty claims and costs paid during the period (52,730) (34,079)
Changes in liability for pre-existing warranties during the period (61,238) (47,560)
Balance at end of period $ 90,000 $ 105,000