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Income Taxes: (Details) (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Current provision (benefit):      
Federal $ 432,211 $ 46,792 $ 183,527
State (2,731) (9,476) (518)
Total current provision 429,480 37,316 183,009
Deferred (benefit) provision:      
Federal (255,154) (2,435,049)  
State (54,484) 670 751
Total deferred (benefit) provision (309,638) (2,434,379) 751
Total current and deferred (benefit) provision $ 119,842 $ (2,397,063) $ 183,760
Reconciliation of the statutory federal rate to the Company's effective income tax rate      
U.S. Federal statutory tax rate (as a percent) 34.00% 34.00% 34.00%
State income taxes, net of federal benefit (as a percent) (1.30%) 6.50% (7.10%)
Permanent items (as a percent) (2.90%) (1.80%) (0.40%)
Research and development tax credits (as a percent) (27.40%) (3.60%) (27.50%)
Valuation allowance (as a percent) (0.80%) (433.50%) 14.20%
Change in unrecognized tax benefits (as a percent) 4.40% (13.50%) 7.20%
Effective income tax rate (as a percent) 6.00% (411.90%) 20.40%