Note 15 - Share Repurchase Program (Details Textual) - USD ($) $ in Thousands		9 Months Ended		12 Months Ended
	Apr. 06, 2017	Sep. 02, 2017	Aug. 27, 2016	Dec. 03, 2016
Stock Repurchased During Period, Value		$ 21,717		$ 23,228
Common Stock [Member]
Stock Repurchased During Period, Value		429		568
Additional Paid-in Capital [Member]
Stock Repurchased During Period, Value		21,288		$ 22,660
The 2017 Share Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount	$ 200,000
Stock Repurchase Program, Period in Force	5 years
Stock Repurchased During Period, Value		12,830
The 2017 Share Repurchase Program [Member] | Common Stock [Member]
Stock Repurchased During Period, Value		250
The 2017 Share Repurchase Program [Member] | Additional Paid-in Capital [Member]
Stock Repurchased During Period, Value		12,580
2010 Share Repurchase Program [Member]
Stock Repurchased During Period, Value		6,284	$ 9,536
2010 Share Repurchase Program [Member] | Common Stock [Member]
Stock Repurchased During Period, Value		125	250
2010 Share Repurchase Program [Member] | Additional Paid-in Capital [Member]
Stock Repurchased During Period, Value		$ 6,159	$ 9,286