Note 17 - Employee Benefit Plans - Change in Value Related to Level 3 Assets (Details) - Foreign Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017
Plan assets, beginning of year	$ 307,166	$ 258,365
Benefits paid	(11,850)	(10,267)
Actuarial gain (loss)	(37,495)	25,691
Translation adjustment	(12,603)	30,565
Plan assets, end of year	249,313	307,166
Fair Value, Inputs, Level 3 [Member]
Plan assets, beginning of year	150,977	127,953
Interest cost	1,682	2,633
Benefits paid	(4,090)	(3,728)
Assets transferred in to (out of) Level 3	696	(2,089)
Actuarial gain (loss)	(35,202)	8,753
Translation adjustment	(4,809)	17,455
Plan assets, end of year	$ 109,254	$ 150,977