Note 9 - Accounting for Share-Based Compensation - Deferred Compensation Units (Details) - shares		12 Months Ended
		Dec. 01, 2018	Dec. 02, 2017	Dec. 03, 2016
Units outstanding (in shares)		475,176	465,435	426,076
Participant contributions (in shares)		23,753	21,618	28,808
Company match contributions (in shares)	[1]	20,812	17,900	21,067
Payouts (in shares)		(10,219)	(29,777)	(10,516)
Units outstanding (in shares)		509,522	475,176	465,435
Non Employee Directors [Member]
Units outstanding (in shares)		443,570	424,319	380,170
Participant contributions (in shares)		16,164	16,051	23,900
Company match contributions (in shares)	[1]	20,053	17,343	20,576
Payouts (in shares)			(14,143)	(327)
Units outstanding (in shares)		479,787	443,570	424,319
Employees [Member]
Units outstanding (in shares)		31,606	41,116	45,906
Participant contributions (in shares)		7,589	5,567	4,908
Company match contributions (in shares)	[1]	759	557	491
Payouts (in shares)		(10,219)	(15,634)	(10,189)
Units outstanding (in shares)		29,735	31,606	41,116

[1] The non-employee directors' company match includes 18,436 and 15,738 and 18,186 deferred compensation units paid as discretionary awards to all non-employee directors in 2018, 2017 and 2016, respectively.