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Note 11 - Post-employment Benefit Obligations (Details Textual)
$ in Thousands
12 Months Ended
May 02, 2017
USD ($)
May 01, 2017
Nov. 30, 2019
USD ($)
Nov. 24, 2018
USD ($)
Nov. 25, 2017
USD ($)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax, Total     $ 1,661 $ 3,214  
Postemployment Benefits Liability, Noncurrent     $ 11,830 13,173  
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     $ 1,157 1,128 $ 1,068
Unfunded Deferred Compensation Plan [Member]          
Pension Cost (Reversal of Cost)     204 216 216
Postemployment Benefits Liability, Noncurrent     1,767 1,837  
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     627 900 431
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   15 years      
Deferred Compensation Arrangement with Individual, Deferred Compensation, Scheduled Distributions, Maximum Number of Years   5 years      
Deferred Compensation Arrangement with Individual, Compensation Expense     196 102 $ 55
Current Net Death Benefit     $ 2,273    
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     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     $ 894 $ 749