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Note 1 - Accumulated Other Comprehensive Loss (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Accumulated balances of items included in accumulated other comprehensive loss:    
Increase in pension liability $ (28,334,000) $ (34,117,000)
Income tax benefit (11,050,000) (13,305,000)
Accumulated other comprehensive loss $ (17,284,000) $ (20,812,000)