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16. Income Tax (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred Tax Assets & (Liabilities):    
Organization, start-up costs & intangible assets $ 8,067 $ 8,750
Stock-based compensation 67 86
Property, plant and equipment (22,717) (22,015)
Net operating loss carryforward and Credits 60,603 49,645
Convertible debt (5) (5)
Ethanol Credits 1,500 1,500
Debt extinguishment 1,361 2,239
Other, net 536 592
Subtotal 49,412 40,792
Valuation Allowance (49,412) (40,792)
Deferred tax assets (liabilities) $ 0 $ 0