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8. Agreements (Tables)
 3 Months Ended
Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Schedule of working capital agreement activity
     As of and for the three months ended March 31,  
    2020       2019    
Ethanol sales   $ 24,383     $ 27,189  
Wet distiller's grains sales     8,374       8,603  
Corn oil sales     928       800  
Corn purchases     29,214       29,261  
Accounts receivable     60       1,340  
Accounts payable     1,749       2,766