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4. Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Total revenues    
Third Eye Capital term note $ 6,577 $ 6,269
Third Eye Capital revolving credit facility 24,927 25,870
Third Eye Capital revenue participation term note 11,042 10,526
Third Eye Capital acquisition term note 19,085 18,260
Cilion shareholder Seller note payable 5,674 5,523
State Bank of India secured term loan 0 4,200
Subordinated notes 7,565 6,340
EB-5 long term promissory notes 35,027 23,907
Unsecured working capital loans 1,817 0
Total debt 111,714 100,895
Less current portion of debt 11,409 11,947
Total long term debt $ 100,305 $ 88,948