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Agreements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Agreements      
Ethanol sales $ 0 $ 26,049 $ 114,593
Wet distiller's grains sales 41,476 32,049 34,510
Corn oil sales 6,184 3,623 3,536
Corn purchases 159,309 107,033 119,786
Accounts receivable 308 94 554
Accounts payable $ 862 $ 169 $ 2,027