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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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