Note 10 - Pension and Postretirement Benefits - Statement of Financial Position as of Fiscal Year End (Details) - USD ($) $ in Thousands	Nov. 28, 2020	Nov. 30, 2019
Non-current liabilities	$ (88,806)	$ (80,214)
Pension Plan [Member]
Non-current assets	43,206	28,759
Pension Plan [Member] | UNITED STATES
Non-current assets	30,672	22,480
Current liabilities	(1,467)	(1,418)
Non-current liabilities	(19,332)	(17,922)
Ending balance	9,873	3,140
Pension Plan [Member] | Foreign Plan [Member]
Non-current assets	12,534	6,263
Current liabilities	(1,701)	(1,723)
Non-current liabilities	(59,521)	(53,750)
Ending balance	(48,688)	(49,210)
Other Postretirement Benefits Plan [Member]
Non-current assets	73,137	58,307
Current liabilities	(226)	(210)
Non-current liabilities	(2,930)	(2,879)
Ending balance	$ 69,981	$ 55,218