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Note 8 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred tax assets: |  |
Inventories | $ 1,392 | $ 520
Accrued liabilities | 3,390 | 3,011
Postretirement health benefits obligation | 5,526 | 5,600
Pension | 1,351 | 2,386
Lease liabilities | 4,861 | 4,916
Capitalized R&D | 3,124 | 2,041
Interest | 12,884 | 8,703
Other | 1,190 | 1,155
Total deferred tax assets | 33,718 | 28,332
Valuation allowance | (420) | (390)
Net deferred tax assets | 33,298 | 27,942
Depreciation and amortization | (27,935) | (22,923)
Leases – right of use assets | (4,627) | (4,922)
Total deferred tax liabilities | (32,562) | (27,845)
Net deferred tax assets (liabilities) | $ 736 |
Net deferred tax assets (liabilities) |  | $ 97

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