Note 4 - Accounts Receivable - Activity in Allowance for Doubtful Accounts (Details) $ in Thousands	6 Months Ended
	May 30, 2020 USD ($)
Balance at November 30, 2019	$ 815
Additions charged to expense	1,074
Write-offs against allowance	(188)
Balance at May 30, 2020	$ 1,701