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Note 12 - Share-based Compensation (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Aug. 27, 2015
Jun. 30, 2007
Dec. 31, 2015
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Stock Option and Compensation Plan 1998 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     12,500      
2015 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     555,000      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 2,250,000          
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase 1,800,000          
Plan Shares Annual Increase Threshold, Percentage 4.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Authorized per One Participant 2,000,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     1,695,000      
Stock Option and Compensation Plan of 2007 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     282,635      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   1,250,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     712,029      
Share-Based Compensation Vested Options Exercisable Term   10 years        
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     0 0 0  
Employee Stock Option [Member]            
Allocated Share-based Compensation Expense     $ 800,000 $ 300,000 $ 500,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     837,635 276,635 263,424 437,797
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense     $ 0 $ 0 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     2,419,529 755,617 798,171 764,034
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate     0.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     7 years 182 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price     $ 8.16 $ 6.09 $ 5.97 $ 5.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value     $ 5,000,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price     $ 6.04      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term     2 years 109 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value     $ 3,100,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 100,000 $ 100,000 $ 400,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 3.72 $ 4.65 $ 3.45  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options     $ 5,800,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     3 years 219 days