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Note 4 - Stock-based Compensation (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 02, 2016
Jul. 04, 2015
Jul. 02, 2016
Jul. 04, 2015
Selling, General and Administrative Expenses [Member]        
Allocated Share-based Compensation Expense $ 0.8 $ 0.5 $ 1.5 $ 1.0
Options and Restricted Stock [Member]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 6.0   $ 6.0  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 182 days  
Performance Shares [Member]        
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Shares Earned     21,118  
Time-based and Performance-based Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 1.6 $ 3.9