Related-Party Transactions (Details) (USD $)	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Related party transaction, purchases from related party	$ 96,482	$ 16,520
Settlement fee payable, related party	(425,000)	0
Interest paid	70,172	81,458
Key Coop [Member]
Related Party Transaction [Line Items]
Related party transaction, description of transaction	100.00%
Loss on contract termination	2,000,000
Reduction in termination fee	50,000
Related party transaction, purchases from related party	41,257,123	29,791,413
Corn cash contracts	228,254
Purchase commitment, remaining minimum amount committed	1,722,132
Related party transaction, amounts of transaction	23,658	30,068
Accounts payable, related parties, current	547,055
Settlement fee payable, related party	1,700,000
Payments for legal settlements	425,000
Interest paid	12,412
Innovative Ag Services [Member]
Related Party Transaction [Line Items]
Accounts payable, related parties, current	$ 94,954