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10. Agreements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Agreements Details    
Ethanol sales $ 100,672 $ 95,556
Wet distiller's grains sales 21,742 22,016
Corn oil sales 3,707 2,995
Corn/Milo purchases 101,768 91,234
Accounts receivable 1,171 743
Accounts payable $ 2,449 $ 1,821