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Note F - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $) | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Deferred tax assets: |  |  |
Inventories | $ 1,688,000 | $ 170,000 | $ 49,000
Accrued liabilities | 2,341,000 | 2,430,000 | 2,506,000
Postretirement health benefits obligation | 6,545,000 | 7,848,000 | 8,060,000
Pension |  | 1,217,000 | 873,000
Other | 101,000 | 452,000 | 1,634,000
Total deferred income tax assets | 10,675,000 | 12,117,000 | 13,122,000
Valuation allowance | (162,000) |  |
Net deferred income tax assets | 10,513,000 | 12,117,000 | 13,122,000
Deferred tax liabilities: |  |  |
Depreciation and amortization | 16,858,000 | 14,376,000 | 13,419,000
Pension | 1,634,000 |  |
| 18,492,000 | 14,376,000 | 13,419,000
Net deferred tax liabilities | $ (7,979,000) | $ (2,259,000) | $ (297,000)

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