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Note 4 - Stock-based Compensation (Details Textual) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2016
Oct. 01, 2016
Oct. 03, 2015
Oct. 01, 2016
Oct. 03, 2015
Selling, General and Administrative Expenses [Member]          
Allocated Share-based Compensation Expense   $ 0.8 $ 0.6 $ 2.3 $ 1.5
Options and Restricted Stock [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 4.8   $ 4.8  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 146 days  
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 3 years        
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       $ 1.7 $ 4.0
Minimum [Member]          
Performance-Based Shares, Payout Opportunity, Percentage 50.00%        
Maximum [Member]          
Performance-Based Shares, Payout Opportunity, Percentage 200.00%