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13. Income Tax (Details 2) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Tax Assets & (Liabilities): |  |
Organization, start-up costs & intangible assets | $ 5,045 | $ 7,435
Stock-based compensation | 223 | 185
Property, plant and equipment | (14,551) | (21,639)
Net operating loss carryforward and Credits | 53,874 | 66,698
Convertible debt | 0 | (5)
Ethanol Credits | 1,500 | 1,500
Debt extinguishment | 91 | 612
Other, net | 545 | 620
Subtotal | 46,727 | 55,406
Valuation Allowance | (46,727) | (55,406)
Deferred tax assets (liabilities) | $ 0 | $ 0

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