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7. Agreements (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Agreements Details    
Ethanol sales $ 28,212 $ 23,545
Wet distiller's grains sales 7,828 5,581
Corn oil sales 923 798
Corn/Milo purchases 27,745 23,468
Accounts receivable 1,193 336
Accounts payable $ 2,573 $ 1,616