Note 11 - Derivatives (Detail) - Summary of derivative contracts (USD $)	Dec. 31, 2012		Sep. 30, 2012
Derivatives not designated as Hedging Instruments:
Asset Derivatives	$ 764,643	[1]		[1]
Derivatives not designated as Hedging Instruments:
Liability Derivatives		[1]	172,271	[1]
Short-Term Derivative Contracts [Member] | Commodity Contract [Member]
Derivatives not designated as Hedging Instruments:
Asset Derivatives	764,643
Derivatives not designated as Hedging Instruments:
Liability Derivatives			$ 172,271

[1] See Fair Value Measurements section for further disclosures regarding fair value of financial instruments.