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7. Agreements (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure 7.Agreements Tables Abstract  
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,  
    2018     2017     2018     2017  
Ethanol sales   $ 29,661     $ 27,996     $ 88,002     $ 79,672  
Wet distiller's grains sales     8,116       6,938       24,443       18,975  
Corn oil sales     714       1,043       2,530       2,693  
Corn purchases     27,786       26,338       84,291       49,727  
Accounts receivable     1,079       776       1,079       776  
Accounts payable     2,416       1,976       2,416       1,976