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.