Note 6 - Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2019	Dec. 01, 2018	Feb. 29, 2020	Dec. 01, 2019
Operating Lease, Liability, Total			$ 26,545
Lessee, Operating Lease, Renewal Term			5 years
Operating Lease, Weighted Average Remaining Lease Term			4 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent			3.70%
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