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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2017
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Inventory, Supplies, Net of Reserves   $ 3,100 $ 2,700  
Allowance for Doubtful Accounts Receivable, Current   3,600 3,000  
Amortization of Deferred Charges   100 100 $ 200
Asset Impairment Charges   $ 2,674 296 1,107
Franchise Extension Period   25 years    
Revenue Recognition, Gift Cards, Breakage   $ 4,500 500  
Deferred Revenue, Period Increase (Decrease)     100 1,300
Net Income (Loss) Attributable to Parent   1,377 27,345 14,362
Advertising Expense   20,700 25,300 25,800
Foreign Currency Transaction Gain (Loss), before Tax   300 2,300 1,600
Subsequent Event [Member] | Increase Deferred Tax Assets [Member]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 1,000      
Subsequent Event [Member] | Decrease Other Assets [Member]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 2,300      
Subsequent Event [Member] | Decrease Retained Earnings [Member]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 1,300      
Increase Deferred Tax Assets [Member] | Subsequent Event [Member]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 1,600      
Increase Additional Paid-in Capital [Member] | Subsequent Event [Member]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 300      
Increase Retained Earning [Member] | Subsequent Event [Member]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 1,900      
Decreases Taxes Payable [Member] | Subsequent Event [Member]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 600      
Prepaid Expenses and Other Current Assets [Member]        
Deferred Compensation Plan Assets   100    
Accounts Payable and Accrued Liabilities [Member]        
Deferred Compensation Liability, Current and Noncurrent   100    
Other Noncurrent Liabilities [Member]        
Deferred Compensation Liability, Current and Noncurrent   700    
Other Assets [Member]        
Deferred Compensation Plan Assets   700 600  
Other Liabilities [Member]        
Deferred Compensation Liability, Current and Noncurrent     600  
Selling, General and Administrative Expenses [Member]        
Allocated Share-based Compensation Expense   $ 3,000 2,100 2,100
Elimination of Certain Discounts [Member]        
Deferred Revenue, Period Increase (Decrease)       500
Net Income (Loss) Attributable to Parent       400
Assessments of the Deferred Revenue Liability [Member]        
Net Income (Loss) Attributable to Parent     $ 100 $ 1,200
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