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Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Inventories $ 524 $ 0
Accrued liabilities 3,208 1,900
Postretirement health benefits obligation 5,584 6,724
Pension 1,868 1,745
Lease liabilities 520 272
Capitalized R&D 1,103 0
Interest 3,168 0
Other 1,399 1,531
Total deferred tax assets 17,374 12,172
Valuation allowance (462) (481)
Deferred tax liabilities:    
Net deferred tax assets 16,912 11,691
Depreciation and amortization (16,987) (9,817)
Leases – right of use assets (536) (269)
Inventories 0 (628)
Total deferred tax liabilities (17,523) (10,714)
Net deferred tax assets (liabilities) $ (611)  
Net deferred tax assets (liabilities)   $ 977