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12. Agreements (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Agreements Details    
Ethanol sales $ 5,497,187 $ 32,053,209
Wet distiller's grains sales 1,683,785 7,831,741
Corn oil sales 175,043   
Corn purchases 5,374,318 36,784,805
Accounts receivable    $ 824,881