Note 17 - Employee Benefit Plans - Funded Status of Defined Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017	Dec. 30, 2018	Dec. 31, 2017
Amounts recognized in accumulated other comprehensive income (after tax)
Total amount recognized				$ 43,610	$ 56,554
UNITED STATES
Benefit obligation, beginning of yearClose File	$ 31,919	$ 29,700
Service cost	0	0	$ 440
Interest cost	1,082	1,256	1,269
Benefits and expenses paid	(2,030)	(1,943)
Actuarial loss (gain)	(1,829)	2,906
Benefit obligation, end of year	29,142	31,919	29,700
Company contributions	2,000
Amounts recognized in accumulated other comprehensive income (after tax)
Unrecognized actuarial loss				6,906	8,582
Accumulated Benefit Obligation				29,100	31,900
Projected Benefit Obligation	31,919	31,919	29,700	29,142	31,919
Benefit obligation, beginning of yearClose File	31,919	29,700
Interest cost	1,082	1,256	1,269
Benefits and expenses paid	(2,030)	(1,943)
Actuarial loss (gain)	(1,829)	2,906
Benefit obligation, end of year	29,142	31,919	29,700
Current liabilities				2,030	2,030
Non-current liabilities				27,112	29,889
Total benefit obligation				29,142	31,919
Foreign Plan [Member]
Benefit obligation, beginning of yearClose File	320,548	277,813
Service cost	1,112	1,628	1,032
Interest cost	5,467	5,559	6,580
Benefits and expenses paid	(11,850)	(10,267)
Business combinations	36,903	0
Actuarial loss (gain)	(53,753)	13,351
Member contributions	233	262
Currency translation adjustment	(13,152)	32,202
Benefit obligation, end of year	285,508	320,548	277,813
Plan assets, beginning of year	307,166	258,365
Actuarial gain (loss)	(37,495)	25,691
Company contributions	4,095	2,812
Benefits paid	(11,850)	(10,267)
Translation adjustment	(12,603)	30,565
Plan assets, end of year	249,313	307,166	258,365
Reconciliation to balance sheet
Funded status benefit asset/(liability)				(36,195)	(13,382)
Net amount recognized				(36,195)	(13,382)
Amounts recognized in accumulated other comprehensive income (after tax)
Unrecognized actuarial loss				37,141	48,443
Unamortized prior service costs				(437)	(471)
Total amount recognized				36,704	47,972
Accumulated Benefit Obligation				284,581	313,257
Projected Benefit Obligation	320,548	320,548	277,813	285,508	320,548
Benefit obligation, beginning of yearClose File	320,548	277,813
Interest cost	5,467	5,559	6,580
Benefits and expenses paid	(11,850)	(10,267)
Actuarial loss (gain)	(53,753)	13,351
Benefit obligation, end of year	285,508	320,548	$ 277,813
Foreign Plan [Member] | Uk Plan [Member]
Benefit obligation, beginning of yearClose File	190,992
Benefit obligation, end of year	157,351	190,992
Plan assets, beginning of year	179,322
Plan assets, end of year	158,990	179,322
Amounts recognized in accumulated other comprehensive income (after tax)
Accumulated Benefit Obligation				157,351	190,992
Projected Benefit Obligation	157,351	190,992		157,351	190,992
Plan Assets				158,990	179,322
Benefit obligation, beginning of yearClose File	190,992
Benefit obligation, end of year	157,351	190,992
Foreign Plan [Member] | Dutch Plan [Member]
Benefit obligation, beginning of yearClose File	129,554
Benefit obligation, end of year	91,837	129,554
Plan assets, beginning of year	127,844
Plan assets, end of year	90,323	127,844
Amounts recognized in accumulated other comprehensive income (after tax)
Accumulated Benefit Obligation				90,910	122,265
Projected Benefit Obligation	91,837	129,554		91,837	129,554
Plan Assets				90,323	127,844
Benefit obligation, beginning of yearClose File	129,554
Benefit obligation, end of year	91,837	129,554
Foreign Plan [Member] | Nora Plan [Member]
Benefit obligation, beginning of yearClose File	0
Benefit obligation, end of year	36,320	0
Amounts recognized in accumulated other comprehensive income (after tax)
Accumulated Benefit Obligation				36,320	0
Projected Benefit Obligation	36,320	0		36,320	0
Plan Assets				$ 0	$ 0
Benefit obligation, beginning of yearClose File	0
Benefit obligation, end of year	$ 36,320	$ 0