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Note 15 - Accumulated Other Comprehensive Loss Components (Details) - USD ($)
Apr. 03, 2016
Dec. 31, 2015
UNITED STATES    
Employee benefit related adjustments $ (16,177,000) $ (16,177,000)
MEXICO    
Employee benefit related adjustments (29,000) (29,000)
Foreign currency translation adjustments (9,584,000) (9,554,000)
Accumulated other comprehensive loss $ (25,790,000) $ (25,760,000)