Related-Party Transactions (Details) (USD $)	0 Months Ended	3 Months Ended			9 Months Ended
	Dec. 28, 2012	Jun. 30, 2013 bu	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2013 bu	Jun. 30, 2012
Related Party Transaction [Line Items]
Settlement fee payable, related party		$ 0	$ 1,700,000		$ 0	$ 1,700,000
Interest paid					107,585	151,519
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
Settlement fee payable, related party			1,700,000
Payments for legal settlements	425,000				425,000
Interest paid	12,412
Interest payable, related parties		20,548	0		20,548	0
Related party transaction, purchases from related party		10,084,927		26,049,305	73,106,359	90,508,021
Corn cash contracts		127,653.06			127,653.06
Purchase commitment, remaining minimum amount committed		907,613			907,613
Corn forward contract		1,001,000			1,001,000
Related party transaction, amounts of transaction		13,140		90,427	54,790	134,623
Accounts payable, related parties, current		534,291			534,291
Heartland [Member]
Related Party Transaction [Line Items]
Related party transaction, purchases from related party		875,929	0		4,490,644	0
Corn cash contracts		7,415.72			7,415.72
Purchase commitment, remaining minimum amount committed		55,840			55,840
Corn forward contract		150,000			150,000
Accounts payable, related parties, current		34,909			34,909
Mid Iowa Cooperative [Member]
Related Party Transaction [Line Items]
Related party transaction, purchases from related party		3,897,395			5,492,158
Corn forward contract		200,000			200,000
Accounts payable, related parties, current		61,971			61,971
Several Other Members [Member]
Related Party Transaction [Line Items]
Related party transaction, purchases from related party		1,630,954			2,111,495
Corn cash contracts		65,660.72			65,660.72
Purchase commitment, remaining minimum amount committed		453,040			453,040
Accounts payable, related parties, current		180,730			180,730
Innovative Ag Services [Member]
Related Party Transaction [Line Items]
Related party transaction, purchases from related party		$ 18,250		$ 1,393	$ 243,080	$ 19,546