Risk Management (Details) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Trading Activity, Gains and Losses, Net [Line Items]
Trading Activity, Gains and Losses, Net	$ (108,804)	$ (2,241,661)	$ 165,417	$ (4,067,361)
Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading Activity, Gains and Losses, Net	29,534	251,340	(7,308)	(691,148)
Cost of Goods, Total [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading Activity, Gains and Losses, Net	(138,338)	(2,493,001)	172,725	(3,376,213)
Gain (Loss) on Settlement of Derivative Instrument [Member] | Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading Activity, Gains and Losses, Net	(7,308)	(288,507)	(7,308)	(953,648)
Gain (Loss) on Settlement of Derivative Instrument [Member] | Cost of Goods, Total [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading Activity, Gains and Losses, Net	1,710,975	(1,149,338)	1,955,188	(3,062,963)
Unrealized Gain (Loss or Write-down) [Member] | Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading Activity, Gains and Losses, Net	36,842	539,847	0	262,500
Unrealized Gain (Loss or Write-down) [Member] | Cost of Goods, Total [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading Activity, Gains and Losses, Net	$ (1,849,313)	$ (1,343,663)	$ (1,782,463)	$ (313,250)