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Warranty: (Details) (USD $)	12 Months Ended
Warranty: (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011
Warranty cost and accrual information
Warranty accrual, beginning of period	$ 955,549	$ 933,270
Accrued expense for fiscal year	89,815	244,408
Warranty cost incurred for fiscal year	(194,865)	(222,129)
Warranty accrual, end of period	$ 850,499	$ 955,549

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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