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Other assets: (Details) (USD $) | 12 Months Ended
--- | ---
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

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