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Note 9 - Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Balance |  | $ 814,931 | $ 739,252 | $ 724,319
Balance |  | 927,556 | 814,931 | 739,252
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |
Balance | [1] | (11,983) | (8,722) | (29,615)
Activity | [1] | 1,147 | (3,261) | 20,893
Balance | [1] | (10,836) | (11,983) | (8,722)
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |
Balance |  | 10,769 | 11,584 | 10,791
Activity |  | (974) | (815) | 793
Balance |  | 9,795 | 10,769 | 11,584
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |
Balance |  | (73,365) | (48,533) | (2,302)
Activity |  | 10,738 | (24,832) | (46,231)
Balance |  | (62,627) | (73,365) | (48,533)
AOCI Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |
Balance |  | (74,579) | (45,671) | (21,126)
Activity |  | 10,911 | (28,908) | (24,545)
Balance |  | $ (63,668) | $ (74,579) | $ (45,671)
[1] | Net of tax of $1.4 million, $1.1 million, and $0.7 million at December 30, 2017; December 31, 2016; and January 2, 2016, respectively.

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