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Note 6 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:      
Inventories $ 1,131,000 $ 721,000 $ 1,664,000
Accrued liabilities 1,872,000 3,139,000 2,450,000
Postretirement health benefits obligation 3,844,000 7,449,000 7,547,000
Pension 3,443,000
Other 583,000 879,000 292,000
Total deferred tax assets 7,430,000 12,188,000 15,396,000
Valuation allowance (459,000) (277,000) (277,000)
Net deferred tax assets 6,971,000 11,911,000 15,119,000
Deferred tax liabilities:      
Depreciation and amortization (8,715,000) (16,119,000) (18,059,000)
Pension (997,000) (3,017,000)
Foreign withholding tax (600,000)
Total deferred tax liabilities (10,312,000) (19,136,000) (18,059,000)
Net deferred tax liabilities $ (3,341,000) $ (7,225,000) $ (2,940,000)