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7. Agreements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
7. Agreements (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Agreements Details Abstract
Ethanol sales	$ 29,661	$ 27,996	$ 88,002	$ 79,672
Wet distiller's grains sales	8,116	6,938	24,443	18,975
Corn oil sales	714	1,043	2,530	2,693
Corn/Milo purchases	27,786	26,338	84,291	49,727
Accounts receivable	1,079	776	1,079	776
Accounts payable	$ 2,416	$ 1,976	$ 2,416	$ 1,976