Commitments and Major Customer and Subsequent Event Purchase Committments (Details) (USD $)		0 Months Ended	12 Months Ended
	Apr. 17, 2013 Financial Standby Letter of Credit [Member]	Apr. 17, 2013 Pipelines [Member]	Sep. 30, 2013 Coal Contract [Member]	Sep. 30, 2012 Coal Contract [Member]	Sep. 30, 2011 Coal Contract [Member]	Sep. 30, 2013 Denaturant [Member] gal	Sep. 30, 2013 Forward Contracts [Member]
Long-term Purchase Commitment [Line Items]
Sales commitments			$ 2,190,720
Payments to suppliers			7,720,923	7,217,257	7,001,676
Long-term purchase commitment, minimum quantity required (in gallons)						90,000
Long-term purchase commitment, amount						196,470	1,130,625
Estimated additions to property, plant and equipment		3,600,000
Property, plant and equipment, additions, term of contract		10 years
Guarantor obligations, current carrying value	$ 3,100,000