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Note F - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Deferred tax assets: |  |  |
Inventories | $ 1,664,000 | $ 1,030,000 | $ 1,688,000
Accrued liabilities | 2,450,000 | 2,538,000 | 2,341,000
Postretirement health benefits obligation | 7,547,000 | 7,602,000 | $ 6,545,000
Pension | $ 3,443,000 | 1,649,000 |
Deferred revenue |  | 1,267,000 |
Other | $ 292,000 | 550,000 | $ 101,000
Total deferred tax assets | 15,396,000 | 14,636,000 | 10,675,000
Valuation allowance | (277,000) | (336,000) | (162,000)
Net deferred tax assets | 15,119,000 | 14,300,000 | 10,513,000
Deferred tax liabilities: |  |  |
Depreciation and amortization | $ (18,059,000) | $ (17,711,000) | (16,858,000)
Pension |  |  | (1,634,000)
Total deferred tax liabilities | $ (18,059,000) | $ (17,711,000) | (18,492,000)
Net deferred tax liabilities | $ (2,940,000) | $ (3,411,000) | $ (7,979,000)

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