Note 6 - Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Nov. 28, 2020	Nov. 30, 2019	Dec. 01, 2019
Operating Lease, Right-of-Use Asset	$ 28,445	$ 0
Lessee, Operating Lease, Renewal Term (Year)	5 years
Operating Lease, Weighted Average Remaining Lease Term (Year)	5 years 7 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent	3.60%
Operating Leases, Rent Expense, Net, Total	$ 19,618	$ 20,620
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset			$ 28,254
Operating Lease, Liability, Total			$ 28,254