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Note 11 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Operating lease liabilities | $ 1,601 | $ 1,123
Inventories | 321 | 247
Accrued vacation pay and stock-based compensation | 252 | 279
Net operating loss (state and foreign) | 241 | 280
Allowance for doubtful accounts | 44 | 44
Accrued warranty | 13 | 19
Acquisition costs | 10 | 12
Tax credit carryforwards | 5 | 112
Other | 71 | 13
Total | 2,558 | 2,129
Valuation allowance | (169) | (234)
Deferred tax assets | 2,389 | 1,895
Deferred tax liabilities: |  |
Net intangible assets | (2,697) | (2,923)
Right of use assets | (1,400) | (1,066)
Depreciation of property and equipment | (214) | (169)
Deferred tax liabilities | (4,311) | (4,158)
Net deferred tax liabilities | $ (1,922) | $ (2,263)

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