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Note 8 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Property, plant and equipment |  | $ 168
Net operating loss carryforwards | 14,579 | 15,622
Tax credit carryforwards | 1,907 | 1,817
Intangible assets | 1,283 | 1,231
Accrued expenses, reserves and other | 2,265 | 1,838
Total deferred tax assets | 20,034 | 20,676
Valuation allowance for deferred tax assets | (1,942) | (1,942)
Net deferred tax assets | 18,092 | 18,734
Other |  | (25)
Property, plant and equipment | 342 |
Intangible assets | (5,087) | (3,856)
Total deferred tax liabilities | (5,429) | (3,881)
Net deferred tax assets | $ 12,663 | $ 14,853

X
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