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7. Agreements (Tables)
 9 Months Ended
Sep. 30, 2017
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,  
    2017     2016     2017     2016  
Ethanol sales   $ 26,394     $ 24,687     $ 75,695     $ 68,993  
Wet distiller's grains sales     5,735       6,114       15,523       16,918  
Corn oil sales     1,043       788       2,693       2,232  
Corn/milo purchases     25,751       23,098       75,478       67,766  
Accounts receivable     776       345       776       345  
Accounts payable     1,976       1,241       1,976       1,241