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5. Notes Payable (Tables)
 6 Months Ended
Jun. 30, 2015
Wet distiller's grains sales  
Schedule of Notes Payable
     June 30, 2015     Dece mber 31, 2014  
Third Eye Capital term note   $ 6,189     $ 7,394  
Third Eye Capital revolving credit facility     22,736       22,330  
Third Eye Capital revenue participation term note     10,397       10,195  
Third Eye Capital acquisition term note     18,053       17,728  
Cilion shareholder seller note payable     5,448       5,373  
State Bank of India secured term loan     6,399       6,032  
Subordinated notes     5,751       5,428  
EB-5 long term promissory notes     21,685       1,534  
Unsecured working capital loans and short-term notes     2,750        1,287  
Total debt     99,408       77,301  
Less current portion of debt     14,781       12,746  
Total long term debt   $ 84,627     $ 64,555  
Maturities of Long-term Debt
Twelve months ended June 30,    Debt Repayments
2016   $               14,781  
2017                   63,017  
2018                     3,198  
2019                   20,000  
Total debt                  100,996  
Discounts                    (1,588)  
Total debt, net of discounts   $               99,408