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6. Agreements (Tables)
 9 Months Ended
Sep. 30, 2016
Agreements Tables  
Schedule of working capital agreement activity
     As of and for the three months ended September 30,     As of and for the nine months ended September 30,  
    2016       2015       2016       2015    
Ethanol sales   $ 24,687     $ 23,906     $ 68,993     $ 70,765  
Wet distiller's grains sales     6,114       5,609       16,918       19,568  
Corn oil sales     788       835       2,232       2,771  
Corn/milo purchases     23,098       24,056       67,766       74,949  
Accounts receivable     345       312       345       312  
Accounts payable     1,241       1,539       1,241       1,539