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Note 18 - Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Foreign currency translation adjustments $ (10,618) $ (10,915)
Accumulated other comprehensive loss (25,254) (25,551)
UNITED STATES    
Employee benefit related adjustments, net of tax (14,748) (14,748)
MEXICO    
Employee benefit related adjustments, net of tax $ 112 $ 112