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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)