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11. Agreements (Details) - USD ($) $ in Thousands	12 Months Ended
11. Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other1
Ethanol sales	$ 114,593	$ 113,855
Wet distiller's grains sales	34,510	32,362
Corn oil sales	3,536	3,393
Corn purchases	119,786	112,687
Accounts receivable	554	433
Accounts payable	$ 2,027	$ 1,882