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Note 11 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Allowance for doubtful accounts | $ 588 | $ 413
Inventory reserves | 1,749 | 1,468
Warranty liability | 1,343 | 1,690
Deferred compensation | 2,237 | 2,124
Pension and retiree health benefit obligations | 866 | 1,225
Accrued vacation | 844 | 1,137
Research expenditures | 6,723 | 5,842
Operating lease liabilities | 17,625 | 4,730
Net operating losses | 1,194 | 1,663
Other accrued liabilities | 4,550 | 4,376
State credit carryforwards | 1,060 | 1,032
Other | 338 | 404
Valuation allowance | (1,510) | (2,005)
Total deferred tax assets | 37,607 | 24,099
Deferred tax liabilities: |  |
Interest rate swaps | (573) | (994)
Tax deductible goodwill and other intangibles | (37,125) | (35,974)
Accelerated depreciation | (6,754) | (9,924)
Operating leases - right of use assets | (17,289) | (4,430)
Other | (440) | (680)
Total deferred tax liabilities | (62,181) | (52,002)
Net deferred tax liabilities | $ (24,574) | $ (27,903)

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