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Income Tax (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred Tax Assets & (Liabilities):    
Organizational costs, start-up and intangible assets $ 5,068 $ 6,325
Stock based compensation 1,174 397
NOLs, unabsorbed depreciation and R&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 & equipment (10,882) (11,600)
Other, net (13) (91)
Total deferred tax liabilities (12,133) (13,053)
Net deferred tax liabilities $ 0 $ (139)