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11. Agreements (Details) (USD $)	3 Months Ended		9 Months Ended
11. Agreements (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Agreements Details
Ethanol sales	$ 36,936,018	$ 37,386,793	$ 69,675,900	$ 100,504,700
Wet distiller's grains sales	8,621,117	10,665,481	16,605,003	26,606,536
Corn oil sales	925,232	501,991	1,555,459	668,500
Corn purchases	31,381,465	46,299,261	62,970,145	120,730,538
Milo purchases	6,776,858		11,425,222
Accounts receivable	927,673	1,414,625	927,673	1,414,625
Accounts payable	$ 2,189,452	$ 3,825,096	$ 2,189,452	$ 3,825,096