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Income Tax (Details 3) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred Tax Assets &amp; (Liabilities): |  |
Organizational costs, start-up and intangible assets | $ 5,068 | $ 6,325
Stock based compensation | 1,174 | 397
NOLs, unabsorbed depreciation and R&amp;D credits | 61,624 | 56,530
Interest expense carryover | 17,436 | 13,389
Ethanol credits | 1,500 | 1,500
Carbon oxide sequestration credit | 3,460 | 1,387
Accrued expenses | 3,312 | 2,813
Operating lease liability | 1,082 | 1,232
Other, net | 737 | 486
Total Deferred Tax Assets | 95,392 | 84,059
Valuation allowance | (83,260) | (71,145)
Net deferred tax assets | 12,133 | 12,914
Deferred Tax Liabilities: |  |
Right of use asset | (1,238) | (1,362)
Property, plant &amp; equipment | (10,882) | (11,600)
Other, net | (13) | (91)
Total deferred tax liabilities | (12,133) | (13,053)
Net deferred tax liabilities | $ 0 | $ (139)

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