Note 8 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Apr. 06, 2017	Nov. 28, 2020	Nov. 30, 2019	Dec. 01, 2018	Dec. 02, 2017
Preferred Stock, Shares Authorized (in shares)		10,045,900	10,045,900
Common Stock, Shares Authorized (in shares)		160,000,000	160,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 1.00	$ 1.00
Common Stock, Shares, Issued, Total (in shares)		51,906,663	51,241,190
Stock Repurchased During Period, Shares (in shares)		0	0	0
Common Stock, Shares, Outstanding, Ending Balance (in shares)		51,906,663	51,241,190	50,732,796	50,388,839
The 2017 Share Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount	$ 200,000
Stock Repurchase Program, Period in Force (Year)	5 years
2010 Share Repurchase Program [Member]
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 187,170