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Note 6 - Property and Equipment, Intangible Assets and Goodwill (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended
May 06, 2015
May 07, 2014
May 06, 2015
May 07, 2014
Aug. 28, 2013
Aug. 27, 2014
Jun. 11, 2015
Note 6 - Property and Equipment, Intangible Assets and Goodwill (Details) [Line Items]              
Finite-Lived Intangible Asset, Useful Life     21 years        
Amortization of Intangible Assets $ 300,000us-gaap_AmortizationOfIntangibleAssets $ 300,000us-gaap_AmortizationOfIntangibleAssets $ 1,000,000us-gaap_AmortizationOfIntangibleAssets $ 1,000,000us-gaap_AmortizationOfIntangibleAssets      
Finite-Lived Intangible Assets, Amortization Expense, Year Four 1,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour   1,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour        
Finite-Lived Intangible Assets, Amortization Expense, Year Five 1,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive   1,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive        
Finite-Lived Intangible Assets, Amortization Expense, Year Two 1,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo   1,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo        
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 1,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear   1,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear        
Finite-Lived Intangible Assets, Amortization Expense, Year Three 1,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree   1,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree        
Goodwill, Impairment Loss 0us-gaap_GoodwillImpairmentLoss            
Goodwill 1,643,000us-gaap_Goodwill   1,643,000us-gaap_Goodwill     1,681,000us-gaap_Goodwill  
Cheeseburger in Paradise [Member] | Lease Option, Not Exercised [Member]              
Note 6 - Property and Equipment, Intangible Assets and Goodwill (Details) [Line Items]              
Number of Restaurants Closed for Disposal         1lub_NumberOfRestaurantsClosedForDisposal
/ us-gaap_LeaseArrangementTypeAxis
= lub_LeaseOptionNotExercisedMember
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
   
Cheeseburger in Paradise [Member] | Goodwill [Member]              
Note 6 - Property and Equipment, Intangible Assets and Goodwill (Details) [Line Items]              
Goodwill, Impairment Loss     38,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
       
Cheeseburger in Paradise [Member]              
Note 6 - Property and Equipment, Intangible Assets and Goodwill (Details) [Line Items]              
Number of Restuarants Acquired         23lub_NumberOfRestuarantsAcquired
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
   
Number of Restaurants Closed for Disposal         5lub_NumberOfRestaurantsClosedForDisposal
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
5lub_NumberOfRestaurantsClosedForDisposal
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
 
Number of Restaurants Not Closed, to Be Converted         18lub_NumberOfRestaurantsNotClosedToBeConverted
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
   
Goodwill, Impairment Loss     38,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
    500,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
 
Number of Restaurants   6us-gaap_NumberOfRestaurants
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
  6us-gaap_NumberOfRestaurants
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
  8us-gaap_NumberOfRestaurants
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
 
Number of Restaurants Underperforming Converted     1lub_NumberOfRestaurantsUnderperformingConverted
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
       
Fuddruckers [Member]              
Note 6 - Property and Equipment, Intangible Assets and Goodwill (Details) [Line Items]              
Number of Restaurants Closed for Disposal       2lub_NumberOfRestaurantsClosedForDisposal
/ us-gaap_SubsegmentsAxis
= lub_FuddruckersMember
     
Number of Restaurants Closed for Conversion           10lub_NumberOfRestaurantsClosedForConversion
/ us-gaap_SubsegmentsAxis
= lub_FuddruckersMember
 
Number of Restaurants Underperforming Converted             4lub_NumberOfRestaurantsUnderperformingConverted
/ us-gaap_SubsegmentsAxis
= lub_FuddruckersMember
Fuddruckers [Member]              
Note 6 - Property and Equipment, Intangible Assets and Goodwill (Details) [Line Items]              
Goodwill, Gross 200,000us-gaap_GoodwillGross
/ us-gaap_BusinessAcquisitionAxis
= lub_FuddruckersMember
  200,000us-gaap_GoodwillGross
/ us-gaap_BusinessAcquisitionAxis
= lub_FuddruckersMember
       
Cheeseburger in Paradise [Member]              
Note 6 - Property and Equipment, Intangible Assets and Goodwill (Details) [Line Items]              
Goodwill, Gross $ 2,000,000us-gaap_GoodwillGross
/ us-gaap_BusinessAcquisitionAxis
= lub_CheeseburgerInParadisMember
  $ 2,000,000us-gaap_GoodwillGross
/ us-gaap_BusinessAcquisitionAxis
= lub_CheeseburgerInParadisMember
       
Trade Names [Member]              
Note 6 - Property and Equipment, Intangible Assets and Goodwill (Details) [Line Items]              
Finite-Lived Intangible Asset, Useful Life     21 years        
Franchise Rights [Member]              
Note 6 - Property and Equipment, Intangible Assets and Goodwill (Details) [Line Items]              
Finite-Lived Intangible Asset, Useful Life     21 years        
Intangible Assets Related to Cheeseburger in Paradise [Member]              
Note 6 - Property and Equipment, Intangible Assets and Goodwill (Details) [Line Items]              
Finite-Lived Intangible Asset, Useful Life     15 years