Note 11 - Post-employment Benefit Obligations (Details Textual) $ in Thousands			12 Months Ended
	May 02, 2017 USD ($)	May 01, 2017	Nov. 25, 2017 USD ($)	Nov. 26, 2016 USD ($)	Nov. 28, 2015 USD ($)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax			$ 4,186	$ 4,150
Postemployment Benefits Liability, Noncurrent			$ 13,326	$ 12,760
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay			25.00%	25.00%	20.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent			8.00%
Defined Contribution Plan, Cost			$ 1,068	$ 865	$ 662
Unfunded Deferred Compensation Plan [Member]
Pension Cost (Reversal of Cost)			216	228	$ 248
Postemployment Benefits Liability, Noncurrent			1,916	$ 1,969
Supplemental Employee Retirement Plan [Member]
Current Net Death Benefit			$ 2,829
Percent Of Final Average Compensation Provided By Supplemental Retirement Income Plan			65.00%
Death Benefit Percent Of Final Average Annual Compensation For Period of 120 Months			50.00%
Death Benefit Payment Term			10 years
Death Benefit Percent Of Final Average Annual Compensation Single Payment			200.00%
Management Savings Plan [member]
Deferred Compensation Arrangement with Individual, Deferred Compensation, Maximum Percentage of Base Salary		75.00%
Deferred Compensation Arrangement with Individual, Deferred Compensation, Maximum Percentage of Discretionary, Annual Incentive or Other Bonus		100.00%
Deferred Compensation Arrangement with Individual, Deferred Compensation, Annual installment Payments, Maximum Number of Years		15 years
Deferred Compensation Arrangement with Individual, Deferred Compensation, Scheduled Distributions, Maximum Number of Years		5 years
Deferred Compensation Arrangement with Individual, Compensation Expense			$ 55
Defined Benefit Plan, Fixed Future Benefit Award	$ 2,000
Defined Benefit Plan, Fixed Future Benefit Award, Individual Participants	$ 400
Defined Benefit Plan, Benefit Obligation, Number of Annual Installments	10
Payment to Acquire Life Insurance Policy, Operating Activities			431
Current Net Death Benefit			$ 14,998