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Note 7 - Changes in Warranty Reserve (Details) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Beginning balance $ 325,107us-gaap_ProductWarrantyAccrual $ 215,758us-gaap_ProductWarrantyAccrual $ 314,311us-gaap_ProductWarrantyAccrual $ 212,759us-gaap_ProductWarrantyAccrual
Warranty provision 21,476us-gaap_ProductWarrantyAccrualWarrantiesIssued 69,157us-gaap_ProductWarrantyAccrualWarrantiesIssued 40,674us-gaap_ProductWarrantyAccrualWarrantiesIssued 83,518us-gaap_ProductWarrantyAccrualWarrantiesIssued
Warranty settlements (19,347)us-gaap_ProductWarrantyAccrualPayments (24,707)us-gaap_ProductWarrantyAccrualPayments 27,749us-gaap_ProductWarrantyAccrualPayments 36,069us-gaap_ProductWarrantyAccrualPayments
Ending balance $ 327,236us-gaap_ProductWarrantyAccrual $ 260,208us-gaap_ProductWarrantyAccrual $ 327,236us-gaap_ProductWarrantyAccrual $ 260,208us-gaap_ProductWarrantyAccrual