Note 11 - Income Taxes - Reconciliation of Effective Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 01, 2018	Dec. 02, 2017	Dec. 03, 2016
Statutory U.S. federal income tax rate	$ 34,605	$ 21,210	$ 57,206
State income taxes, net of federal benefit	1,148	(959)	2,012
Foreign dividend repatriation	1,258	276	519
Foreign operations	(3,253)	(9,565)	(3,386)
Impact of option valuation	330	(1,381)	(1,879)
Interest income not taxable in the U.S.		(626)	(525)
Change in valuation allowance	5,213	(3,694)	(2,219)
Tax impact of special charges, net			173
Research and development tax credit	(982)	(647)	(2,291)
Section 199 manufacturing deduction	(319)		(1,658)
Royal Adhesives transaction costs		2,271
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	42,007
Dividends received deduction	(8,484)
Deferred tax rate change	(79,488)
Other	1,609	2,925	968
Total income tax expense (benefit)	$ (6,356)	$ 9,810	$ 48,920