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Note F - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Deferred tax assets: |  |  |
Inventories | $ 721,000 | $ 1,664,000 | $ 1,030,000
Accrued liabilities | 3,139,000 | 2,450,000 | 2,538,000
Postretirement health benefits obligation | 7,449,000 | 7,547,000 | 7,602,000
Pension |  | 3,443,000 | 1,649,000
Deferred revenue |  |  | 1,267,000
Other | 879,000 | 292,000 | 550,000
Total deferred tax assets | 12,188,000 | 15,396,000 | 14,636,000
Valuation allowance | (277,000) | (277,000) | (336,000)
Net deferred tax assets | 11,911,000 | 15,119,000 | 14,300,000
Deferred tax liabilities: |  |  |
Depreciation and amortization | (16,119,000) | (18,059,000) | (17,711,000)
Pension | (3,017,000) |  |
Total deferred tax liabilities | (19,136,000) | (18,059,000) | (17,711,000)
Net deferred tax liabilities | $ (7,225,000) | $ (2,940,000) | $ (3,411,000)

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