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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)