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Other assets: (Details) (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Other assets:      
Intangible assets, net of accumulated amortization of $495,037 and $441,637 at September 30, 2013 and September 30, 2012 $ 105,200 $ 158,600  
Other non-current assets 116,333    
Total other assets 221,533 158,600  
Accumulated amortization of intangible assets 495,037 441,637  
Impairment charges 0 0 0
Total intangible amortization expense $ 100,000 $ 100,000 $ 100,000