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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)