Note 12 - Income Taxes - Reconciliation of Effective Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2019	Dec. 01, 2018	Dec. 02, 2017
Statutory U.S. federal income tax rate	$ 36,294	$ 34,605	$ 21,210
State income taxes, net of federal benefit	2,785	1,148	(959)
Foreign dividend repatriation	2,854	1,258	276
Foreign operations	8,712	(3,253)	(9,565)
Impact of option valuation	0	330	(1,381)
Interest income not taxable in the U.S.	0	0	(626)
Executive compensation over $1 million	1,661	611	0
Change in valuation allowance	1,097	5,213	(3,694)
Research and development tax credit	(802)	(982)	(647)
Section 199 manufacturing deduction	0	(319)	0
Foreign-derived intangible income	(2,240)	0	0
Cross currency swap	2,677	0	0
Royal Adhesives transaction costs	0	0	2,271
Transition tax	0	42,007	0
Dividends received deduction	0	(8,484)	0
Deferred tax rate change	0	(79,488)	0
Other	(3,630)	998	2,925
Total income tax expense (benefit)	$ 49,408	$ (6,356)	$ 9,810