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7. Agreements (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Agreements Details Abstract        
Ethanol sales $ 30,129 $ 28,130 $ 58,341 $ 51,675
Wet distiller's grains sales 8,499 6,457 16,327 12,038
Corn oil sales 893 852 1,816 1,650
Corn/Milo purchases 28,760 26,338 56,505 49,727
Accounts receivable 852 384 852 384
Accounts payable $ 2,241 $ 1,719 $ 2,241 $ 1,719