Note 1 - The Company, Organization and Description of Business (Details)
12 Months Ended
Dec. 28, 2014
Dec. 30, 2012
Dec. 29, 2013
Entity Operated Units [Member] | Denver, Colorado [Member] | Ruth's Chris Steak House [Member]      
Note 1 - The Company, Organization and Description of Business (Details) [Line Items]      
Number of Franchise Restaurants Opened During Period 1    
Entity Operated Units [Member] | Gaithersburg, Maryland [Member] | Ruth's Chris Steak House [Member]      
Note 1 - The Company, Organization and Description of Business (Details) [Line Items]      
Number of Franchise Restaurants Opened During Period 1    
Entity Operated Units [Member] | Marina del Rey, California [Member] | Ruth's Chris Steak House [Member]      
Note 1 - The Company, Organization and Description of Business (Details) [Line Items]      
Number of Franchise Restaurants Opened During Period 1    
Entity Operated Units [Member] | Ruth's Chris Steak House [Member]      
Note 1 - The Company, Organization and Description of Business (Details) [Line Items]      
Number of Restaurants 65    
Number of Franchise Restaurants Opened During Period 3    
Franchised Units [Member] | International [Member] | Ruth's Chris Steak House [Member]      
Note 1 - The Company, Organization and Description of Business (Details) [Line Items]      
Number of Restaurants 20    
Number of Franchise Restaurants Opened During Period   4  
Franchised Units [Member] | International [Member]      
Note 1 - The Company, Organization and Description of Business (Details) [Line Items]      
Number of Restaurants 20    
Franchised Units [Member] | Ruth's Chris Steak House [Member]      
Note 1 - The Company, Organization and Description of Business (Details) [Line Items]      
Number of Restaurants 77    
Number of Franchise Restaurants Opened During Period 3   4
Managed [Member] | Ruth's Chris Steak House [Member]      
Note 1 - The Company, Organization and Description of Business (Details) [Line Items]      
Number of Restaurants 1    
Company-owned Fish Market Restaurants [Member] | Mitchell's Fish Market [Member]      
Note 1 - The Company, Organization and Description of Business (Details) [Line Items]      
Number of Restaurants 18    
Company-owned Steakhouse Restaurants [Member] | Cameron's/Mitchell's Steakhouse [Member]      
Note 1 - The Company, Organization and Description of Business (Details) [Line Items]      
Number of Restaurants 3    
Ruth's Chris Steak House [Member]      
Note 1 - The Company, Organization and Description of Business (Details) [Line Items]      
Number of Restaurants 143    
Number of Franchise Restaurants Opened During Period 6