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14. Income Tax (Details 3) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets & (Liabilities): |  |
Organizational costs, start-up and intangible assets | $ 6,325 | $ 3,997
Stock based compensation | 397 | 328
NOLs, unabsorbed depreciation and R&D credits | 56,530 | 53,400
Interest expense carryover | 13,389 | 9,131
Ethanol credits | 1,500 | 1,500
Carbon oxide sequestration credit | 1,387 | 0
Accrued expenses | 2,813 | 2,532
Operating lease liability | 1,232 | 152
Other, net | 486 | 140
Subtotal | 84,059 | 71,180
Valuation allowance | (71,145) | (59,547)
Net deferred tax assets | 12,914 | 11,633
Deferred Tax Liabilities: |  |
Right of use asset | (1,362) | (147)
Property, plant & equipment | (11,600) | (12,554)
Other | (91) | (55)
Total deferred tax liabilities | (13,053) | (12,756)
Net deferred tax liabilities | $ (139) | $ (1,123)

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