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11. Agreements (Details) - USD ($) $ in Thousands	12 Months Ended
11. Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Agreements
Ethanol sales	$ 113,855	$ 106,419
Wet distiller's grains sales	32,362	26,422
Corn oil sales	3,393	3,707
Corn purchases	112,687	101,768
Accounts receivable	433	1,171
Accounts payable	$ 1,882	$ 2,449