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Note 13 - Taxes on Income - Provisions for Federal, Foreign and State Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Current expense/(benefit):      
Federal $ 10,245 $ 6,886 $ 1,524
Foreign 11,923 12,934 9,279
State 1,414 1,633 1,403
Current expense 23,582 21,453 12,206
Deferred expense/(benefit):      
Federal 20,467 6,186 19,971
Foreign 1,214 (1,937) 3,795
State 2,030 (728) (2,624)
Deferred expense 23,711 3,521 21,142
Total income tax expense $ 47,293 $ 24,974 $ 33,348