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Note 7 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Aug. 27, 2015
Jun. 30, 2007
Mar. 31, 2016
Mar. 31, 2015
Mar. 29, 2015
Dec. 31, 2015
Dec. 28, 2014
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     1,269,709        
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         874,709  
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     1,855,000        
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     552,403        
Share-Based Compensation Vested Options Exercisable Term   10 years          
Employee Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     160,000 0      
Allocated Share-based Compensation Expense     $ 0.4   $ 0.1    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 3.94        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     1,552,344 276,635   837,635 276,635
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     2,419,903 753,117   2,419,529 755,617
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     7 years 292 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price     $ 8.49 $ 6.09   $ 8.16 $ 6.09
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value     $ 5.7        
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, Weighted Average Exercise Price     $ 6.17        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value     $ 2.7        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     159,626 2,500 2,500    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 0.7   $ 0.1    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options     $ 6.0        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     3 years 146 days