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11. Agreements (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Agreements Details        
Ethanol sales $ 27,242,694 $ 31,064,699 $ 32,739,882 $ 63,117,908
Wet distiller's grains sales 6,321,953 8,109,315 8,005,737 15,941,056
Corn oil sales 455,184 166,509 630,227 166,509
Corn purchases 26,145,005 37,646,472 31,519,323 74,431,277
Milo purchases 4,648,364    4,648,364   
Accounts receivable 1,578,206 890,716 1,578,206 890,716
Accounts payable $ 2,096,112 $ 3,097,956 $ 2,096,112 $ 3,097,956