Note 3 - Accounting for Share-based Compensation - Nonvested Restricted Stock Activity (Details) - $ / shares	12 Months Ended
	Dec. 03, 2016	Nov. 28, 2015	Nov. 29, 2014	Nov. 30, 2013
Nonvested (in shares)	347,173	377,283	447,676
Nonvested (in dollars per share)	$ 42.17	$ 40.70	$ 33.76
Nonvested (Year)	1 year	292 days	1 year	1 year 73 days
Granted (in shares)	253,515	144,100	126,536
Granted (in dollars per share)	$ 35.40	$ 40.92	$ 48.84
Granted (Year)	1 year 109 days	1 year 73 days	1 year 73 days
Vested (in shares)	(177,856)	(151,647)	(182,337)
Vested (in dollars per share)	$ 41.91	$ 37.47	$ 48.16
Forfeited (in shares)	(33,135)	(22,563)	(14,592)
Forfeited (in dollars per share)	$ 38.40	$ 40.66	$ 37.80
Forfeited (Year)	1 year 182 days	292 days	1 year 36 days
Nonvested (in shares)	389,697	347,173	377,283	447,676
Nonvested (in dollars per share)	$ 38.36	$ 42.17	$ 40.70	$ 33.76
Restricted Stock Units (RSUs) [Member]
Nonvested (in shares)	237,013	188,661	135,231
Granted (in shares)	253,515	144,100	126,536
Vested (in shares)	(104,828)	(82,495)	(68,293)
Forfeited (in shares)	(32,956)	(13,253)	(4,813)
Nonvested (in shares)	352,744	237,013	188,661	135,231
Restricted Stock [Member]
Nonvested (in shares)	110,160	188,622	312,445
Granted (in shares)
Vested (in shares)	(73,028)	(69,152)	(114,044)
Forfeited (in shares)	(179)	(9,310)	(9,779)
Nonvested (in shares)	36,953	110,160	188,622	312,445