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Note 8 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Net operating loss carryforwards | $ 12,481 | $ 14,579
Tax credit carryforwards | 2,070 | 1,907
Intangible assets | 1,352 | 1,283
Accrued expenses, reserves and other | 2,176 | 2,265
Research and development | 984 | 0
Total deferred tax assets | 19,063 | 20,034
Valuation allowance for deferred tax assets | (1,942) | (1,942)
Net deferred tax assets | 17,121 | 18,092
Property, plant and equipment | (262) | (342)
Intangible assets | 5,538 | 5,087
Total deferred tax liabilities | (5,800) | (5,429)
Net deferred tax assets | $ 11,321 | $ 12,663

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