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12. Agreements (Tables)
 3 Months Ended
Mar. 31, 2013
Agreements Tables  
Schedule of working capital agreement activity
    Three months ending March 31, 2013   Three months ending March 31, 2012
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