Note 11 - Derivatives (Details) - Summary of derivative contracts (Commodity Contract [Member], USD $)	Jun. 30, 2013		Sep. 30, 2012
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Gross amounts recognized	$ 928,299	[1]	$ 51,530
Offsetting adjustments	(113,321)	[1]	(51,530)
Net presentation on Condensed Balance Sheets	814,978	[1]	0	[1]
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross amounts recognized	113,321	[1]	223,801
Offsetting adjustments	(113,321)	[1]	(51,530)
Net presentation on Condensed Balance Sheets	$ 0	[1]	$ 172,271	[1]

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