Supplementary Information on Oil, Ngl and Natural Gas Reserves (Unaudited) (Details 5) (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Standardized measure computations since these estimates reflect the valuation process
Future cash inflows	$ 408,694,869	$ 494,523,456	$ 489,691,155
Future production costs	(135,516,703)	(146,168,829)	(148,727,914)
Future development costs	(33,167,310)	(43,425,811)	(52,975,820)
Asset retirement obligation	(2,122,950)	(1,843,875)	(1,730,369)
Future income tax expense	(83,543,516)	(107,111,317)	(99,118,090)
Future net cash flows	154,344,390	195,973,624	187,138,962
10% annual discount	(86,930,102)	(117,591,190)	(114,638,553)
Standardized measure of discounted future net cash flows	$ 67,414,288	$ 78,382,434	$ 72,500,409