Note 10 - Pension and Postretirement Benefits - Statement of Financial Position as of Fiscal Year End (Details) - USD ($) $ in Thousands	Dec. 01, 2018	Dec. 02, 2017
Prepaid pension costs	$ 37,881	$ 30,145
Non-current liabilities	(70,680)	(71,205)
Pension Plan [Member] | UNITED STATES
Prepaid pension costs	28,396	19,520
Current liabilities	(1,493)	(1,501)
Non-current liabilities	(17,332)	(19,279)
Ending balance	9,571	(1,260)
Pension Plan [Member] | Foreign Plan [Member]
Prepaid pension costs	9,467	10,912
Current liabilities	(2,077)	(1,879)
Non-current liabilities	(46,010)	(45,307)
Ending balance	(38,620)	(36,274)
Other Postretirement Benefits Plan [Member]
Prepaid pension costs	48,872	39,163
Current liabilities	(201)	(210)
Non-current liabilities	(2,603)	(2,978)
Ending balance	$ 46,068	$ 35,975