Note 4 - Supplemental Financial Statement Information - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 01, 2018	Dec. 02, 2017	Dec. 03, 2016
Balance at beginning of year	$ 11,670	$ 12,310	$ 11,893
Charged to expenses and other adjustments	6,444	744	2,455
Write-offs	(2,187)	(1,546)	(1,758)
Foreign currency translation effect	(1,911)	162	(280)
Balance at end of year	$ 14,046	$ 11,670	$ 12,310