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Note 17 - Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Apr. 01, 2018
Dec. 31, 2017
Apr. 02, 2017
Foreign currency translation adjustments $ (10,507)   $ (10,915)
Accumulated other comprehensive loss (25,143) $ (25,551) (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