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Note 8 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Inventories $ 0 $ 646
Accrued liabilities 1,900 1,484
Postretirement health benefits obligation 6,724 6,815
Pension 1,745 1,688
Lease liabilities 272 390
Other 1,531 1,434
Total deferred tax assets 12,172 12,457
Valuation allowance (481) (567)
Net deferred tax assets 11,691 11,890
Deferred tax liabilities:    
Depreciation and amortization (9,817) (9,536)
Leases – right of use assets (269) (388)
Foreign withholding tax 0 (100)
Inventories (628) 0
Total deferred tax liabilities (10,714) (10,024)
Net deferred tax assets $ 977 $ 1,866