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5. Notes Payable (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Total revenues    
Third Eye Capital term note $ 7,349 $ 7,193
Third Eye Capital revolving credit facility 31,603 38,349
Third Eye Capital revenue participation term note 9,890 9,465
Third Eye Capital acquisition term note 17,620 17,280
Cilion shareholder Seller note payable 5,083 4,869
State Bank of India secured term loan 6,066 5,857
Subordinated notes 4,982 5,317
EB-5 long term promissory notes 1,521 1,037
Unsecured working capital loans and short-term notes 1,086 2,391
Total debt 85,200 91,758
Less current portion of debt 12,134 17,966
Total long term debt $ 73,066 $ 73,792