Note 3 - Accounting for Share-Based Compensation - Deferred Compensation Units (Details) - shares		12 Months Ended
		Dec. 03, 2016	Nov. 28, 2015	Nov. 29, 2014
Units outstanding (in shares)		426,076	394,850	373,968
Participant contributions (in shares)		28,808	21,017	18,776
Company match contributions (in shares)	[1]	21,067	22,106	17,105
Payouts (in shares)		(10,516)	(11,897)	(14,999)
Units outstanding (in shares)		465,435	426,076	394,850
Non Employee Directors [Member]
Units outstanding (in shares)		380,170	342,547	312,680
Participant contributions (in shares)		23,900	16,312	14,347
Company match contributions (in shares)	[1]	20,576	21,636	16,613
Payouts (in shares)		(327)	(325)	(1,093)
Units outstanding (in shares)		424,319	380,170	342,547
Employees [Member]
Units outstanding (in shares)		45,906	52,303	61,288
Participant contributions (in shares)		4,908	4,705	4,429
Company match contributions (in shares)	[1]	491	470	492
Payouts (in shares)		(10,189)	(11,572)	(13,906)
Units outstanding (in shares)		41,116	45,906	52,303

[1] The non-employee directors' company match includes 18,186 and 20,005 deferred compensation units paid as discretionary awards to all non-employee directors in 2016 and 2015, respectively.