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Note 4 - Stock-based Compensation (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 03, 2015
Sep. 27, 2014
Oct. 03, 2015
Sep. 27, 2014
Selling, General and Administrative Expenses [Member]        
Allocated Share-based Compensation Expense $ 0.6 $ 0.4 $ 1.5 $ 1.6
Options and Restricted Stock [Member]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 3.7   $ 3.7  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 146 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 4.0 $ 3.6