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6. Agreements (Tables)
 3 Months Ended
Mar. 31, 2017
Agreements Tables  
Schedule of working capital agreement activity
     As of and for the three months ended March 31,  
    2017     2016  
Ethanol sales   $ 22,544     $ 20,251  
Wet distiller's grains sales     4,564       5,175  
Corn oil sales     798       707  
Corn/milo purchases     23,468       21,353  
Accounts receivable     336       302  
Accounts payable     1,616       1,391