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
	Feb. 27, 2021	Feb. 29, 2020
Pension Plan [Member] | UNITED STATES
Service cost	$ 0	$ 0
Interest cost	2,325	2,935
Expected return on assets	(7,781)	(6,440)
Prior service cost (benefit)	(1)	(1)
Actuarial loss	799	1,799
Net periodic benefit	(4,658)	(1,707)
Pension Plan [Member] | Foreign Plan [Member]
Service cost	833	725
Interest cost	733	794
Expected return on assets	(3,077)	(2,842)
Prior service cost (benefit)	17	16
Actuarial loss	1,022	950
Net periodic benefit	(472)	(357)
Other Postretirement Benefits Plan [Member]
Service cost	5	18
Interest cost	205	284
Expected return on assets	(2,235)	(1,994)
Prior service cost (benefit)	0	0
Actuarial loss	18	15
Net periodic benefit	$ (2,007)	$ (1,677)