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Agreements (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Agreements        
Ethanol sales $ 0 $ 1,666 $ 0 $ 26,049
Wet distiller's grains sales 10,630 7,466 21,665 15,840
Corn oil sales 1,695 1,051 2,737 1,979
Corn purchases 42,166 22,541 80,159 51,755
Accounts receivable 65 55 65 55
Accounts payable $ 509 $ 250 $ 509 $ 250