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6. Agreements (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Agreements Details    
Ethanol sales $ 22,544 $ 20,251
Wet distiller's grains sales 4,564 5,175
Corn oil sales 798 707
Corn/Milo purchases 23,468 21,353
Accounts receivable 336 302
Accounts payable $ 1,616 $ 1,391