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6. Agreements (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Agreements Details        
Ethanol sales $ 26,757 $ 24,055 $ 49,301 $ 44,306
Wet distiller's grains sales 5,224 5,629 9,788 10,804
Corn oil sales 852 737 1,650 1,444
Corn/Milo purchases 26,338 23,315 49,727 44,668
Accounts receivable 384 374 384 374
Accounts payable $ 1,719 $ 1,543 $ 1,719 $ 1,543