Commitments and Contingencies (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Fairmont Plant [Member] gal	Dec. 31, 2010 Fairmont Plant [Member]	Dec. 31, 2008 Fairmont Plant [Member]	Dec. 31, 2012 Wood River Plant [Member] gal	Dec. 31, 2010 Wood River Plant [Member]	Dec. 31, 2008 Wood River Plant [Member]
Deferred Lease Payments	$ 1,600,000
Subsidiaries Leasing Amount Per Year	6,700,000
Operating Lease Rent Expense Paid By Each Subsidiary Per Year		4,300,000
Operating Leases, Rent Expense	11,389,000	8,092,000
Origination Fee Per Bushel Under Lease Agreements	0.048
Minimum Annual Origination Fee Payable	1,200,000
Number Of Bushels Contracted To Purchase			67,000			6,852,000
Percentage Of Purchase Commitments Of Projected Requirements						15.00%
Percentage Of Minimum Annual Commissions Payable In Average Selling Price	1.00%
Minimum Annual Operating Lease Payments				50,000	1,200,000		250,000	1,500,000
Number Of Gallons Of Ethanol			82,500,000			82,500,000
Deferred Ethanol Commissions	1,000,000
Intial Mininum Annual Lease Payments					$ 800,000			$ 1,000,000
Mileage Limit For Escalation Of Monthly Rental Charges	30,000
Term Of Operating Lease					20 years			20 years