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4. Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Third Eye Capital term notes	$ 7,024	$ 7,024
Third Eye Capital revolving credit facility	67,077	62,869
Third Eye Capital revenue participation term notes	11,794	11,794
Third Eye Capital acquisition term notes	26,282	25,518
Third Eye Capital promissory note	3,434	2,815
Cilion shareholder seller notes payable	6,161	6,124
Subordinated notes	11,816	11,502
EB-5 long term promissory notes	42,176	41,932
Unsecured working capital loans	2,077	2,631
GAFI Term and Revolving loans	31,207	30,216
Total debt	209,048	202,425
Less current portion of debt	23,363	22,740
Total long term debt	$ 185,685	$ 179,685

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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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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