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Warranty: (Details) (USD $)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Warranty cost and accrual information    
Warranty accrual, beginning of period $ 701,456us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 850,499us-gaap_ProductWarrantyAccrualClassifiedCurrent
Accrued expense for fiscal year 265,362us-gaap_ProductWarrantyAccrualWarrantiesIssued (272)us-gaap_ProductWarrantyAccrualWarrantiesIssued
Warranty cost incurred for fiscal year (189,219)us-gaap_ProductWarrantyAccrualPayments (148,771)us-gaap_ProductWarrantyAccrualPayments
Warranty accrual, end of period $ 777,599us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 701,456us-gaap_ProductWarrantyAccrualClassifiedCurrent