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Commitments and Contingencies: (Details) (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Capital Lease      
Term of lease 5 years    
Implicit interest rate (as a percent) 7.20%    
Capitalized cost included in property and equipment $ 57,450    
Annual amortization 0 5,000 5,000
Balance due on leases 0 0 13,000
Operating Leases      
Rent expense under operating leases 39,000 30,000 31,000
Purchase obligations      
Purchase obligations on open purchase orders 3,800,000 1,900,000 1,400,000
Product Liability      
Product liability insurance $ 50,000,000