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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)