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14. Income Tax (Details 2) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets & (Liabilities):
Org, start-up and intangible assets	$ 4,723	$ 5,045
Stock based comp	301	223
Prop., plant, and equip.	(13,631)	(14,551)
NOLs and R&D credits	56,270	53,874
Interest expense carryover	4,722	0
Ethanol Credits	1,500	1,500
Debt extinguishment	0	91
Other, net	450	545
Subtotal	54,335	46,727
Valuation allowance	(54,335)	(46,727)
Deferred tax assets (liabilities)	$ 0	$ 0

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