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Note 11 - Income Tax (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Federal net operating loss carryforward | $ 39,340 | $ 36,803
Stock based compensation and other items | 4,779 | 0
Intellectual property | 58,504 | 58,504
Accrued expense | 0 | 1,262
Patent amortization | 4 | 4
Deferred tax assets before valuation | 102,627 | 96,573
Valuation allowance | (102,627) | (96,573)
Net deferred income tax assets | $ 0 | $ 0

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