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Note 4 - Stock-based Compensation (Details Textual) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2017
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
May 11, 2017
Minimum [Member]            
Performance-based Shares, Payout Opportunity, Percentage 25.00%          
Maximum [Member]            
Performance-based Shares, Payout Opportunity, Percentage 200.00%          
Options and Restricted Stock [Member]            
Allocated Share-based Compensation Expense   $ 0.9 $ 0.8 $ 1.9 $ 1.5  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 5.4   $ 5.4    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 219 days    
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       $ 2.2 $ 1.6  
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       13,704    
The 2017 Omnibus Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           1,000,000