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9. Agreements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
9. Agreements (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Ethanol sales	$ 27,456	$ 29,661	$ 84,453	$ 88,002
Wet distiller's grains sales	8,783	8,116	26,119	24,443
Corn oil sales	934	714	2,586	2,530
Corn/milo purchases	30,446	27,786	90,426	84,291
Accounts receivable	1,066	1,079	1,066	1,079
Accounts payable	$ 2,484	$ 2,416	$ 2,484	$ 2,416