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Note 10 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Aug. 27, 2015
Sep. 30, 2015
Sep. 28, 2014
Sep. 30, 2015
Sep. 28, 2014
Dec. 28, 2014
Dec. 29, 2013
Jun. 30, 2007
Stock Option and Compensation Plan 1998 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   0   0        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   12,500   12,500        
2015 Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   1,610,000   1,610,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 3.72   $ 3.72        
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              
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   282,635        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     3,000   11,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 3.98   $ 4.65      
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   732,117   732,117        
Employee Stock Option [Member]                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       3 years 292 days        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   922,635 276,635 922,635 276,635 276,635 263,424  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       1,610,000 11,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   $ 0.1 $ 0.1 $ 0.1 $ 0.1      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   2,354,617 755,617 2,354,617 755,617 755,617 798,171  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term       7 years 219 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price   $ 8.10 $ 6.09 $ 8.10 $ 6.09 $ 6.09 $ 5.97  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value   $ 2.3   $ 2.3        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term       2 years 182 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price   $ 6.05   $ 6.05        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value   $ 2.3   $ 2.3        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   2,500 500 5,000 28,343      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options   $ 5.8   $ 5.8