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11. Agreements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
11. Agreements (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Agreements Details
Ethanol sales	$ 24,247	$ 40,799	$ 46,859	$ 87,747
Wet distiller's grains sales	6,609	11,708	13,959	21,423
Corn oil sales	1,071	1,344	1,936	2,245
Corn purchases	24,934	33,619	50,893	66,947
Accounts receivable	329	458	329	458
Accounts payable	$ 1,673	$ 2,122	$ 1,673	$ 2,122