Note 9 - Accounting for Share-based Compensation - Deferred Compensation Units (Details) - shares		12 Months Ended
		Nov. 27, 2021	Nov. 28, 2020	Nov. 30, 2019
Units outstanding (in shares)		499,818	562,324	509,522
Participant contributions (in shares)		23,523	31,822	33,319
Company match contributions1 (in shares)	[1]	21,167	24,414	24,837
Payouts (in shares)		(27,623)	(118,742)	(5,354)
Units outstanding (in shares)		516,885	499,818	562,324
Non Employee Directors [Member]
Units outstanding (in shares)		455,265	525,660	479,787
Participant contributions (in shares)		13,036	18,008	22,153
Company match contributions1 (in shares)	[1]	20,118	23,033	23,720
Payouts (in shares)		(19,895)	(111,436)	0
Units outstanding (in shares)		468,524	455,265	525,660
Employees [Member]
Units outstanding (in shares)		44,553	36,664	29,735
Participant contributions (in shares)		10,487	13,814	11,166
Company match contributions1 (in shares)	[1]	1,049	1,381	1,117
Payouts (in shares)		(7,728)	(7,306)	(5,354)
Units outstanding (in shares)		48,361	44,553	36,664

[1] The non-employee directors’ company match includes 18,814, 21,323 and 21,504 deferred compensation units paid as discretionary awards to all non-employee directors in 2021, 2020 and 2019, respectively.