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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