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Note 1 - Description of Business and Summary of Significant Accounting Policies - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accumulated balances of items included in accumulated other comprehensive loss:    
Increase in pension liability $ (28,926) $ (28,334)
Income tax benefit (11,281) (11,050)
Accumulated other comprehensive loss $ (17,645) $ (17,284)