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Note 11 - Post-employment Benefit Obligations (Details Textual)
$ in Thousands
12 Months Ended
May 02, 2017
USD ($)
May 01, 2017
Nov. 24, 2018
USD ($)
Nov. 25, 2017
USD ($)
Nov. 26, 2016
USD ($)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax, Total     $ 3,214 $ 4,186  
Postemployment Benefits Liability, Noncurrent     $ 13,173 13,326  
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     $ 1,128 1,068 $ 865
Unfunded Deferred Compensation Plan [Member]          
Pension Cost (Reversal of Cost)     216 216 $ 228
Postemployment Benefits Liability, Noncurrent     1,837 1,916  
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     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     102 55  
Current Net Death Benefit     $ 2,813    
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%    
Supplemental Employee Retirement Plan [Member] | Non-current Portion of Post Employment Benefits Liability [Member]          
Deferred Compensation Arrangement with Individual, Recorded Liability     $ 749 $ 55