Note 10 - Pension and Postretirement Benefits (Details Textual) - USD ($)	12 Months Ended
	Nov. 28, 2020	Nov. 30, 2019	Dec. 01, 2018
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	75.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Defined Contribution Plan, Annual Retirement Percentage	1.00%
Defined Contribution Plan, Cost	$ 10,764,000	$ 10,784,000	$ 11,034,000
Liability, Defined Benefit Plan, Total	$ 9,819,000	8,494,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Increase (decrease) in Discount Rate	0.50%
Impact on Pension and Other Postretirement Benefit Expense from a Change in Discount Rate	$ 223,000
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	0	0
Group Term Life Insurance Plan [Member]
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	$ 0	0
Equity Funds [Member] | Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	60.00%
Fixed Income Funds [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	40.00%
Fixed Income Funds [Member] | Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	40.00%
UNITED STATES
Defined Benefit Plan, Accumulated Benefit Obligation	$ 418,019	$ 409,800
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.53%	3.19%	4.51%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	7.50%	7.50%	7.75%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Increase (Decrease) in Expected Long-term Return on Assets	0.50%
Impact on Pension and Other Retirement Benefiit Expense of a Change in Expected Long-term Rate of Return on Assets	$ 2,538,000
UNITED STATES | Equity Funds [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	8.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	60.00%
UNITED STATES | Fixed Income Funds [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	3.60%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	40.00%
UNITED KINGDOM
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.75%
GERMANY
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	5.75%
Foreign Plan [Member]
Defined Benefit Plan, Accumulated Benefit Obligation	$ 239,572	$ 224,619
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.23%	6.21%	6.20%
Four Percent Match [Member]
Defined Contribution Plan, Cost	$ 7,468,000
Three Percent Match [Member]
Defined Contribution Plan, Cost	$ 3,296,000
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	4.50%	4.50%	4.50%