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Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Operating lease liabilities | $ 1,407 | $ 1,601
Inventories | 387 | 321
Accrued vacation pay and stock-based compensation | 354 | 252
Net operating loss (state and foreign) | 205 | 241
Allowance for doubtful accounts | 45 | 44
Accrued warranty | 31 | 13
Acquisition costs | 9 | 10
Tax credit carryforwards | 17 | 5
Other | 49 | 71
Total | 2,504 | 2,558
Valuation allowance | (64) | (169)
Deferred tax assets | 2,440 | 2,389
Deferred tax liabilities: |  |
Net intangible assets | (2,381) | (2,697)
Right-of-use assets | (1,245) | (1,400)
Depreciation of property and equipment | (193) | (214)
Deferred tax liabilities | (3,819) | (4,311)
Net deferred tax liabilities | $ (1,379) | $ (1,922)

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