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Note 8 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Inventories | $ 1,391 | $ 1,161
Accrued liabilities | 2,095 | 2,306
Postretirement health benefits obligation | 5,884 | 5,350
Pension | 240 |
Lease liabilities | 361 |
Other | 1,360 | 840
Total deferred tax assets | 11,331 | 9,657
Valuation allowance | (567) | (496)
Net deferred tax assets | 10,764 | 9,161
Deferred tax liabilities: |  |
Depreciation and amortization | (9,446) | (9,351)
Leases – right of use assets | (361) |
Pension |  | (1,113)
Foreign withholding tax | (100) | (600)
Total deferred tax liabilities | (9,907) | (11,064)
Net deferred tax assets (liabilities) | $ 857 |
Net deferred tax assets (liabilities) |  | $ (1,903)

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