Note 10 - Post-employment Benefit Obligations (Details Textual) $ in Thousands			12 Months Ended
	May 02, 2017 USD ($)	May 01, 2017	Nov. 28, 2020 USD ($)	Nov. 30, 2019 USD ($)	Nov. 24, 2018 USD ($)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax, Total			$ 1,874	$ 1,661
Postemployment Benefits Liability, Noncurrent			$ 12,089	11,830
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay			25.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent			8.00%
Defined Contribution Plan, Cost			$ 611	1,157	$ 1,128
Unfunded Deferred Compensation Plan [Member]
Pension Cost (Reversal of Cost)			176	204	216
Postemployment Benefits Liability, Noncurrent			1,676	1,767
Management Savings Plan [member]
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			609	627	900
Current Net Death Benefit				14,998
Supplemental Employee Retirement 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 (Year)		15 years
Deferred Compensation Arrangement with Individual, Deferred Compensation, Scheduled Distributions, Maximum Number of Years (Year)		5 years
Deferred Compensation Arrangement with Individual, Compensation Expense			264	196	$ 102
Current Net Death Benefit			$ 2,070
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 (Month)			120 months
Death Benefit Percent Of Final Average Annual Compensation Single Payment			200.00%
Supplemental Employee Retirement Plan [Member] | Non-current Portion of Post Employment Benefits Liability [Member]
Deferred Compensation Arrangement with Individual, Recorded Liability			$ 1,250	$ 894