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Note 8 - Income Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Federal net operating loss carryforward | $ 25,306 | $ 15,949
Intellectual Property | 61,787 | 0
Accrued Interest | 129 | 0
Patent amortization | 5 | (6)
Deferred tax assets before valuation | 87,227 | 15,943
Valuation allowance | (87,227) | (15,943)
Net deferred income tax assets | $ 0 | $ 0

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