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Related Party Transactions: (Details) - USD ($)
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Shareholder      
Related Party Transactions      
Legal fees $ 114,000 $ 99,000 $ 45,000
Individual married to a shareholder and a daughter of Company's Chairman and Chief Executive Officer      
Related Party Transactions      
Service fees $ 11,000 $ 6,000 $ 4,000