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Agreements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Agreements (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Agreements
Ethanol sales	$ 0	$ 0	$ 0	$ 26,049
Wet distiller's grains sales	8,919	7,143	30,584	22,983
Corn oil sales	1,515	827	4,252	2,806
Corn purchases	39,058	25,513	119,217	77,268
Accounts receivable	88	161	88	161
Accounts payable	$ 307	$ 1,978	$ 307	$ 1,978