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9. Agreements (Details) - USD ($) $ in Thousands	3 Months Ended
9. Agreements (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Ethanol sales	$ 27,189	$ 28,212
Wet distiller's grains sales	8,603	7,828
Corn oil sales	800	923
Corn/milo purchases	29,261	27,745
Accounts receivable	1,340	1,193
Accounts payable	$ 2,766	$ 2,573