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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