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Note 6 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Deferred tax assets: |  |  |
Inventories | $ 1,131,000 | $ 721,000 | $ 1,664,000
Accrued liabilities | 1,872,000 | 3,139,000 | 2,450,000
Postretirement health benefits obligation | 3,844,000 | 7,449,000 | 7,547,000
Pension |  |  | 3,443,000
Other | 583,000 | 879,000 | 292,000
Total deferred tax assets | 7,430,000 | 12,188,000 | 15,396,000
Valuation allowance | (459,000) | (277,000) | (277,000)
Net deferred tax assets | 6,971,000 | 11,911,000 | 15,119,000
Deferred tax liabilities: |  |  |
Depreciation and amortization | (8,715,000) | (16,119,000) | (18,059,000)
Pension | (997,000) | (3,017,000) |
Foreign withholding tax | (600,000) |  |
Total deferred tax liabilities | (10,312,000) | (19,136,000) | (18,059,000)
Net deferred tax liabilities | $ (3,341,000) | $ (7,225,000) | $ (2,940,000)

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