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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 12 Months Ended
Jan. 01, 2018
Jan. 01, 2017
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Inventory, Supplies, Net of Reserves       $ 2,700,000 $ 3,100,000  
Inventory Valuation Reserves       1,000,000 1,000,000  
Allowance for Doubtful Accounts Receivable, Current       3,100,000 3,600,000  
Amortization of Deferred Charges       100,000 100,000 $ 100,000
Asset Impairment Charges       $ 104,000 2,674,000 296,000
Franchise Extension Period       25 years    
Unredeemed Gift Cards, Breakage       $ 8,300,000 4,500,000 500,000
Deferred Revenue, Period Increase (Decrease)       100,000 0 100,000
Advertising Expense       19,000,000 20,700,000 25,300,000
Foreign Currency Transaction Gain (Loss), before Tax       1,600,000 (300,000) (2,300,000)
Revenues       357,866,000 364,204,000 377,694,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest       13,813,000 5,309,000 17,898,000
Increase Deferred Tax Assets [Member]            
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   $ 1,000,000        
Decrease Other Assets [Member]            
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   2,300,000        
Decrease Retained Earnings [Member]            
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   1,300,000        
Increase Deferred Tax Assets [Member]            
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   1,600,000        
Increase Additional Paid-in Capital [Member]            
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   300,000        
Increase Retained Earning [Member]            
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   1,900,000        
Decreases Taxes Payable [Member]            
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   $ 600,000        
Accounting Standards Update 2014-09 [Member] | Scenario, Forecast [Member]            
Revenues     $ (3,900,000)      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest     $ (3.90)      
Accounting Standards Update 2014-09 [Member] | Subsequent Event [Member]            
Cumulative Effect on Retained Earnings, before Tax $ 12,300,000          
Cumulative Effect on Retained Earnings, Tax $ 3,000,000          
Prepaid Expenses and Other Current Assets [Member]            
Deferred Compensation Plan Assets       100,000 100,000  
Other Noncurrent Liabilities [Member]            
Deferred Compensation Liability, Current and Noncurrent       1,000,000 700,000  
Selling, General and Administrative Expenses [Member]            
Allocated Share-based Compensation Expense       3,400,000 3,000,000 $ 2,100,000
Loyalty Program [Member]            
Deferred Revenue       $ 1,400,000 $ 1,800,000  
Trademarks And Intellectual Property [Member]            
Finite-Lived Intangible Asset, Useful Life       3 years    
Minimum [Member] | Trademarks And Intellectual Property [Member]            
Finite-Lived Intangible Asset, Useful Life       1 year    
Maximum [Member] | Trademarks And Intellectual Property [Member]            
Finite-Lived Intangible Asset, Useful Life       3 years    
Leasehold Improvements [Member]            
Property, Plant and Equipment, Useful Life       10 years    
Furniture and Fixtures [Member] | Minimum [Member]            
Property, Plant and Equipment, Useful Life       3 years    
Furniture and Fixtures [Member] | Maximum [Member]            
Property, Plant and Equipment, Useful Life       7 years    
Software and Software Development Costs [Member] | Minimum [Member]            
Property, Plant and Equipment, Useful Life       3 years    
Software and Software Development Costs [Member] | Maximum [Member]            
Property, Plant and Equipment, Useful Life       5 years