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Other assets: (Details) (USD $)	12 Months Ended
Other assets: (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Other assets:
Intangible assets, net	$ 158,600	$ 208,408
Accumulated amortization of intangible assets	441,637	391,829
Total intangible amortization expense	$ 100,000	$ 100,000	$ 100,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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