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6. Agreements (Tables)
 6 Months Ended
Jun. 30, 2017
Agreements Tables  
Schedule of working capital agreement activity
     As of and for the three months ended June 30,          As of and for the six months ended June 30,     
    2017       2016       2017       2016    
Ethanol sales   $ 26,757     $ 24,055     $ 49,301       44,306  
Wet distiller's grains sales     5,224       5,629       9,788       10,804  
Corn oil sales     852       737       1,650       1,444  
Corn/milo purchases     26,338       23,315       49,727       44,668  
Accounts receivable     384       374       384       374  
Accounts payable     1,719       1,543       1,719       1,543