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Note 7 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Net operating loss carryforwards | $ 12,567 | $ 12,481
Tax credit carryforwards | 2,239 | 2,070
Intangible assets | 1,412 | 1,352
Accrued expenses, reserves and other | 1,996 | 2,176
Research and development | 1,999 | 984
Total deferred tax assets | 20,213 | 19,063
Valuation allowance for deferred tax assets | (2,697) | (1,942)
Net deferred tax assets | 17,516 | 17,121
Property, plant and equipment | (79) | (262)
Intangible assets | 8,219 | 5,538
Total deferred tax liabilities | (8,298) | (5,800)
Net deferred tax assets | $ 9,218 | $ 11,321

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