Note 4 - Accounts Receivable - Activity in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 27, 2021	Nov. 28, 2020	Nov. 30, 2019
Balance	$ 1,211	$ 815
Additions (recoveries) charged to expense	(156)	492	$ 61
Reductions to allowance, net	(259)	(96)
Balance	$ 796	$ 1,211	$ 815