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Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
9 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Balance at beginning of period $ 180,000 $ 180,000
Liabilities accrued for warranties issued during the period 222,520 165,269
Warranty claims and costs paid during the period (205,629) (157,377)
Changes in liability for pre-existing warranties during the period 3,109 (22,892)
Balance at end of period $ 200,000 $ 165,000