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7. Agreements (Tables)
 3 Months Ended
Mar. 31, 2018
Agreements Tables  
Schedule of working capital agreement activity
     As of and for the three months ended March 31,  
    2018     2017  
Ethanol sales   $ 28,212     $ 23,545  
Wet distiller's grains sales     7,828       5,581  
Corn oil sales     923       798  
Corn/milo purchases     27,745       23,468  
Accounts receivable     1,193       336  
Accounts payable     2,573       1,616