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12. Agreements (Tables)
 12 Months Ended
Dec. 31, 2015
Agreements Tables  
Schedule of working capital agreement activity
    For the year ended December 31,  
    2015     2014  
Ethanol sales   $ 92,729     $ 148,408  
Wet distiller's grains sales     24,556       32,689  
Corn oil sales     3,485       4,501  
Corn purchases     97,179       120,915  
Accounts receivable     305       368  
Accounts payable     1,455       1,965