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10. Agreements (Tables)
 12 Months Ended
Dec. 31, 2017
Agreements Tables  
Schedule of working capital agreement activity
   

  As of and for

the years ended

December 31,

  
    2017      2016   
             
Ethanol sales $   $ 100,672       95,556  
Wet distiller's grains sales     21,742       22,016  
Corn oil sales     3,707       2,995  
Corn/milo purchases     101,768       91,234  
Accounts receivable     1,171       743  
Accounts payable     2,449       1,821