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14. Income Tax (Details 3) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets & (Liabilities):
Org, start-up and intangible assets	$ 3,997	$ 4,723
Stock based comp	328	301
Prop., plant, and equip.	(12,554)	(13,631)
NOLs and R&D credits	53,400	56,270
Interest expense carryover	9,131	4,722
Ethanol credits	1,500	1,500
Other, net	2,622	450
Subtotal	58,424	54,335
Valuation allowance	(58,424)	(54,335)
Deferred tax assets (liabilities)	$ 0	$ 0

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