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Note 7 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Net operating loss carryforwards | $ 11,460 | $ 12,567
Research and development | 2,812 | 1,999
Tax credit carryforwards | 2,600 | 2,239
Accrued expenses, reserves and other | 2,419 | 1,996
Intangible assets | 1,521 | 1,412
Total deferred tax assets | 20,812 | 20,213
Valuation allowance for deferred tax assets | (2,416) | (2,697)
Net deferred tax assets | 18,396 | 17,516
Intangible assets | (8,176) | (8,219)
Accrued expenses, reserves and other | (68) | (79)
Total deferred tax liabilities | (8,244) | (8,298)
Net deferred tax assets | $ 10,152 | $ 9,218

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