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7. Agreements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
7. Agreements (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Agreements Details
Ethanol sales	$ 26,394	$ 24,687	$ 75,695	$ 68,993
Wet distiller's grains sales	5,735	6,114	15,523	16,918
Corn oil sales	1,043	788	2,693	2,232
Corn/Milo purchases	25,751	23,098	75,478	67,766
Accounts receivable	776	345	776	345
Accounts payable	$ 1,976	$ 1,241	$ 1,976	$ 1,241