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11. Agreements (Tables)
 12 Months Ended
Dec. 31, 2019
Other1  
Schedule of working capital agreement activity
    As of and for the years ended December 31,  
    2019     2018  
Ethanol sales   $ 114,593       113,855  
Wet distillers' grains sales     34,510       32,362  
Corn oil sales     3,536       3,393  
Corn purchases     119,786       112,687  
Accounts receivable     554       433  
Accounts payable     2,027       1,882