Note 11 - Derivatives (Detail) - Summary of derivative contracts (Commodity Contract [Member], USD $)	Mar. 31, 2013		Sep. 30, 2012
Non-Current Assets [Member]
Gross amounts recognized	$ 19,912	[1]
Offsetting adjustments		[1]
Net presentation on Condensed Balance Sheets	19,912	[1]
Current Liabilities [Member]
Gross amounts recognized	1,279,626	[1]	223,801	[1]
Offsetting adjustments		[1]	(51,530)	[1]
Net presentation on Condensed Balance Sheets	1,279,626	[1]	172,271	[1]
Current Assets [Member]
Gross amounts recognized			51,530	[1]
Offsetting adjustments			(51,530)	[1]
Net presentation on Condensed Balance Sheets				[1]

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