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4. Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Third Eye Capital term note	$ 7,024	$ 6,931
Third Eye Capital revolving credit facility	47,225	35,371
Third Eye Capital revenue participation term note	11,794	11,636
Third Eye Capital acquisition term note	23,841	20,048
Cilion shareholder seller note payable	5,974	5,824
Subordinated notes	10,080	8,725
EB-5 long term promissory notes	38,536	36,039
Unsecured working capital loans	4,822	4,861
GAFI term and revolving loans	25,821	24,351
Total debt	175,117	153,786
Less current portion of debt	17,298	15,625
Total long term debt	$ 157,819	$ 138,161

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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. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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