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4. Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Third Eye Capital term notes	$ 7,022	$ 7,024
Third Eye Capital revolving credit facility	54,702	47,225
Third Eye Capital revenue participation term notes	11,792	11,794
Third Eye Capital acquisition term notes	24,482	23,841
Third Eye Capital promissory note	2,156	0
Cilion shareholder seller notes payable	6,048	5,974
Subordinated notes	10,779	10,080
EB-5 long term promissory notes	39,944	38,536
Unsecured working capital loans	3,616	4,822
GAFI Term and Revolving loans	26,583	25,821
Total debt	187,124	175,117
Less current portion of debt	21,356	17,298
Total long term debt	$ 165,768	$ 157,819

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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