Note 11 - Pension and Postretirement Benefits - Statement of Financial Position as of Fiscal Year End (Details) - USD ($) $ in Thousands	Nov. 30, 2019	Dec. 01, 2018
Non-current liabilities	$ (80,214)	$ (70,680)
Pension Plan [Member]
Non-current assets	28,759	37,881
Pension Plan [Member] | UNITED STATES
Non-current assets	22,480	28,396
Current liabilities	(1,418)	(1,493)
Non-current liabilities	(17,922)	(17,332)
Ending balance	3,140	9,571
Pension Plan [Member] | Foreign Plan [Member]
Non-current assets	6,263	9,467
Current liabilities	(1,723)	(2,077)
Non-current liabilities	(53,750)	(46,010)
Ending balance	(49,210)	(38,620)
Other Postretirement Benefits Plan [Member]
Non-current assets	58,307	48,872
Current liabilities	(210)	(201)
Non-current liabilities	(2,879)	(2,603)
Ending balance	$ 55,218	$ 46,068