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11. Agreements (Tables)
12 Months Ended
Dec. 31, 2018
Agreements  
Schedule of working capital agreement activity
   

 As of and for the year ended

December 31,

 
    2018     2017  
Ethanol sales   $ 113,855     $  106,419  
Wet distiller's grains sales     32,362       26,422  
Corn oil sales     3,393       3,707  
Corn purchases     112,687       101,768  
Accounts receivable     433       1,171  
Accounts payable     1,882       2,449