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Note 19 - Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Foreign currency translation adjustments, net of tax $ (10,915) $ (11,334)
Accumulated other comprehensive loss (25,551) (26,598)
UNITED STATES    
Employee benefit related adjustments, net of tax (14,748) (15,445)
MEXICO    
Employee benefit related adjustments, net of tax $ 112 $ 181