Note 9 - Stockholders' Equity (Details Textual) - USD ($)	12 Months Ended
	Nov. 28, 2015	Nov. 29, 2014	Nov. 30, 2013	Dec. 01, 2012	Sep. 30, 2010
2010 Share Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount					$ 100,000,000
Stock Repurchased During Period, Shares	500,000	250,000	375,000
Stock Repurchased During Period, Value	$ 17,066,000	$ 12,254,000	$ 15,292,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 44,897,000
Common Stock, Shares, Outstanding	50,074,310	50,310,803	50,228,543	49,903,266
Preferred Stock, Shares Authorized	10,045,900	10,045,900
Common Stock, Shares Authorized	160,000,000	160,000,000
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Common Stock, Shares, Issued	50,074,310	50,310,803
Stock Repurchased During Period, Shares	500,000	250,000	375,000
Stock Repurchased During Period, Value	$ 19,290,000	$ 15,510,000	$ 17,638,000
Preferred Stock, Redemption Price Per Share	$ 95