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Warranty: (Details) (USD $)	12 Months Ended
Warranty: (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Warranty cost and accrual information
Warranty accrual, beginning of period	$ 850,499	$ 955,549
Accrued expense for fiscal year	(272)	89,815
Warranty cost incurred for fiscal year	(148,771)	(194,865)
Warranty accrual, end of period	$ 701,456	$ 850,499

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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