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4. Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Third Eye Capital term note $ 7,024 $ 7,024
Third Eye Capital revolving credit facility 62,869 47,225
Third Eye Capital revenue participation term note 11,794 11,794
Third Eye Capital acquisition term note 25,518 23,841
Third Eye Capital promissory note 2,815 0
Cilion shareholder seller note payable 6,124 5,974
Subordinated notes 11,502 10,080
EB-5 long term promissory notes 41,932 38,536
Unsecured working capital loans 2,631 4,822
GAFI term and revolving loans 30,216 25,821
Total debt 202,425 175,117
Less current portion of debt 22,740 17,298
Total long term debt $ 179,685 $ 157,819