Note 9 - Accounting for Share-Based Compensation - Deferred Compensation Units (Details) - shares		12 Months Ended
		Dec. 02, 2017	Dec. 03, 2016	Nov. 28, 2015
Units outstanding (in shares)		465,435	426,076	394,850
Participant contributions (in shares)		21,618	28,808	21,017
Company match contributions (in shares)	[1]	17,900	21,067	22,106
Payouts (in shares)		(29,777)	(10,516)	(11,897)
Units outstanding (in shares)		475,176	465,435	426,076
Non Employee Directors [Member]
Units outstanding (in shares)		424,319	380,170	342,547
Participant contributions (in shares)		16,051	23,900	16,312
Company match contributions (in shares)	[1]	17,343	20,576	21,636
Payouts (in shares)		(14,143)	(327)	(325)
Units outstanding (in shares)		443,570	424,319	380,170
Employees [Member]
Units outstanding (in shares)		41,116	45,906	52,303
Participant contributions (in shares)		5,567	4,908	4,705
Company match contributions (in shares)	[1]	557	491	470
Payouts (in shares)		(15,634)	(10,189)	(11,572)
Units outstanding (in shares)		31,606	41,116	45,906

[1] The non-employee directors’ company match includes 15,738, 18,186 and 20,005 deferred compensation units paid as discretionary awards to all non-employee directors in 2017, 2016, and 2015, respectively.