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Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred income tax assets: |  |
Net operating loss carryforwards | $ 482 | $ 808
R&D tax credit carryforwards | 1,723 | 1,672
Impairment charges | 0 | 723
Compensation costs | 10 | 149
Vacation accrual | 174 | 141
Intangible assets | 27 | 0
Capitalized research and development | 356 | 0
Other items | 263 | 114
Deferred income tax assets | 3,035 | 3,607
Less: valuation allowance | (2,957) | (2,990)
Deferred income tax assets, net of valuation allowance | 78 | 617
Deferred incomes tax liability: |  |
Property, plant and equipment | (11) | (617)
Prepaid expenses | (67) | 0
Deferred income tax asset, net | $ 0 | $ 0

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