Note 6 - Components of Net Periodic Benefit Related to Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 28, 2021	Aug. 29, 2020	Aug. 28, 2021	Aug. 29, 2020
Pension Plan [Member] | UNITED STATES
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	2,325	2,935	6,974	8,803
Expected return on assets	(7,781)	(6,439)	(23,342)	(19,318)
Prior service cost (benefit)	(1)	(1)	(2)	(2)
Actuarial loss	799	1,799	2,398	5,397
Net periodic benefit	(4,658)	(1,706)	(13,972)	(5,120)
Pension Plan [Member] | Foreign Plan [Member]
Service cost	824	743	2,478	2,184
Interest cost	743	785	2,215	2,348
Expected return on assets	(3,120)	(2,812)	(9,301)	(8,408)
Prior service cost (benefit)	17	16	51	48
Actuarial loss	1,020	959	3,059	2,839
Net periodic benefit	(516)	(309)	(1,498)	(989)
Other Postretirement Benefits Plan [Member]
Service cost	5	18	16	55
Interest cost	206	284	616	851
Expected return on assets	(2,236)	(1,994)	(6,708)	(5,982)
Prior service cost (benefit)	0	0	0	0
Actuarial loss	18	15	55	46
Net periodic benefit	$ (2,007)	$ (1,677)	$ (6,021)	$ (5,030)