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8. Agreements (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]    
Ethanol sales $ 24,383 $ 27,189
Wet distiller's grains sales 8,374 8,603
Corn oil sales 928 800
Corn purchases 29,214 9,261
Accounts receivable 60 1,340
Accounts payable $ 1,749 $ 2,766