Note 8 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Apr. 06, 2017	Nov. 27, 2021	Nov. 28, 2020	Nov. 30, 2019	Dec. 01, 2018
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)		52,777,753	51,906,663
Common Stock, Shares, Outstanding, Ending Balance (in shares)		52,777,753	51,906,663	51,241,190	50,732,796
Stock Repurchased During Period, Shares (in shares)		0	0	0
The 2017 Share Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount	$ 200,000
Stock Repurchase Program, Period in Force (Year)	5 years
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 187,170