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Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) (USD $)
6 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Balance at beginning of period $ 100,000us-gaap_ProductWarrantyAccrual $ 190,000us-gaap_ProductWarrantyAccrual
Liabilities accrued for warranties issued during the period 185,083us-gaap_ProductWarrantyAccrualWarrantiesIssued 212,255us-gaap_ProductWarrantyAccrualWarrantiesIssued
Warranty claims and costs paid during the period (106,415)us-gaap_ProductWarrantyAccrualPayments (134,535)us-gaap_ProductWarrantyAccrualPayments
Changes in liability for pre-existing warranties during the period (28,668)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease (102,720)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease
Balance at end of period $ 150,000us-gaap_ProductWarrantyAccrual $ 165,000us-gaap_ProductWarrantyAccrual