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7. Agreements (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Agreements Details        
Ethanol sales $ 31,064,699 $ 21,903,394 $ 63,117,908 $ 21,903,394
Wet distiller's grains sales 8,109,315 4,115,192 15,941,056 4,115,192
Corn oil sales 166,509    166,509   
Corn purchases 37,646,472 26,292,878 74,431,277 26,292,878
Accounts receivable $ 890,716 $ 507,570 $ 890,716 $ 507,570