Note 7 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Apr. 06, 2017	Nov. 30, 2019	Dec. 01, 2018	Dec. 02, 2017	Dec. 03, 2016
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		$ 1.00	$ 1.00
Common Stock, Shares, Issued, Total		51,241,190	50,732,796
Common Stock, Shares, Outstanding, Ending Balance		51,241,190	50,732,796	50,388,839	50,141,343
Stock Repurchased During Period, Shares		(0)	(0)	375,000
Stock Repurchased During Period, Value		$ 3,026	$ 4,688	$ 21,831
The 2017 Share Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount	$ 200,000
Stock Repurchase Program, Period in Force	5 years
2010 Share Repurchase Program [Member]
Stock Repurchased During Period, Shares				375,000
Stock Repurchased During Period, Value				$ 19,114
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 187,170