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11. Agreements (Tables)
 12 Months Ended
Dec. 31, 2020
Other1  
Schedule of working capital agreement activity
    As of and for the years ended December 31,  
    2020     2019  
Ethanol sales   $ 26,049     $ 114,593  
Wet distiller's grains sales     32,049       34,510  
Corn oil sales     3,623       3,536  
Corn purchases     107,033       119,786  
Accounts receivable     94       554  
Accounts payable     169       2,027