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Note 18 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 36,943 | $ 35,234
Acquisition assets | 2,257 | 0
Stock options | 665 | 750
Research and development credits | 641 | 641
Accruals | 477 | 464
Operating lease liabilities | 368 | 472
Property and equipment | 28 | 13
Other deferred tax assets | 6 | 331
Total deferred tax assets | 41,385 | 37,905
Deferred tax liabilities: |  |
Operating lease right-of-use assets | (337) | (472)
Total deferred tax liabilities | (337) | (472)
Valuation allowance | (41,048) | (37,433)
Net deferred taxes | $ 0 | $ 0

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