Derivatives (Details 2) (Not Designated as Hedging Instrument [Member], USD $)	Jun. 30, 2012	Sep. 30, 2011
Summary of derivative contracts
Asset Derivatives	$ 169,472	$ 269,329
Liability Derivatives		53,389
Commodity contracts [Member] | Short-term derivative contracts [Member]
Summary of derivative contracts
Asset Derivatives	169,472	269,329
Liability Derivatives
Commodity contracts [Member] | Long-term derivative contracts [Member]
Summary of derivative contracts
Asset Derivatives
Liability Derivatives		$ 53,389