Note 15 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2019	Dec. 01, 2018	Dec. 02, 2017
Operating Leases, Rent Expense, Total	$ 19,618	$ 20,620	$ 15,199
Accrued Environmental Loss Contingencies, Noncurrent	8,535	10,665
Penalties from Possible Resale of Products by Customers Contrary to U.S. Law and Regulations [Member] | Minimum [Member]
Loss Contingency, Estimate of Possible Loss	0
Penalties from Possible Resale of Products by Customers Contrary to U.S. Law and Regulations [Member] | Maximum [Member]
Loss Contingency, Estimate of Possible Loss	10,000
Facility in Simpsonville, South Carolina [Member]
Operating Leases, Rent Expense, Total	$ 4,117	$ 4,784