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12. Agreements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Agreements Details    
Ethanol sales $ 92,729 $ 148,408
Wet distiller's grains sales 24,556 32,689
Corn oil sales 3,485 4,501
Corn purchases 97,179 120,915
Accounts receivable 305 368
Accounts payable $ 1,455 $ 1,965