Note 7 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Apr. 06, 2017	Dec. 13, 2018	Dec. 01, 2018	Dec. 02, 2017	Dec. 03, 2016	Nov. 28, 2015
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, Total			50,732,796	50,388,839
Stock Repurchased During Period, Shares				375,000	500,000
Stock Repurchased During Period, Value			$ 4,688	$ 21,831	$ 23,228
Common Stock, Shares, Outstanding, Ending Balance			50,732,796	50,388,839	50,141,343	50,074,310
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			500,000
Stock Repurchased During Period, Value		$ 19,114			$ 20,861
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 187,170