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Note F - Income Taxes (Detail) - Deferred Tax Assets and Liabilities (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Deferred tax assets: |  |  |
Inventories | $ 170 | $ 49 |
Accrued liabilities | 2,430 | 2,506 | 2,237
Postretirement health benefits obligation | 7,848 | 8,060 | 7,849
Pension | 1,217 | 873 |
Other | 452 | 1,634 | 1,834
| 12,117 | 13,122 | 11,920
Deferred tax liabilities: |  |  |
Inventories |  |  | 391
Depreciation and amortization | 14,376 | 13,419 | 11,524
Pension |  |  | 2,001
| 14,376 | 13,419 | 13,916
Net deferred tax liabilities | $ (2,259) | $ (297) | $ (1,996)

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