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Note 10 - Shareholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Apr. 02, 2017
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Jul. 02, 2017
Jul. 03, 2016
Nov. 19, 2015
May 31, 2015
Oct. 07, 2014
Mar. 05, 2012
Common Stock, Shares Authorized                   120,000,000
Common Stock, Par or Stated Value Per Share                   $ 0.10
Common Stock, Dividends, Per Share, Cash Paid   $ 0.25 $ 0.22 $ 0.18            
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 39,500                
Stock Based Compensation Rate at Which Employee Stock Option Exercisable   100.00%                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               5,161,020    
Number of Authorized Stock Reduced by Issuance of Other Than Stock Option Award               1.33    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term   2 years                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term   2 years                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value   $ 1,400                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value   $ 1,400                
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit   $ 4.31                
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit   $ 13.04                
Employee Stock Option [Member]                    
Allocated Share-based Compensation Expense   $ 0 $ 0 $ 0            
Employee Stock Option [Member] | Minimum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   3 years                
Employee Stock Option [Member] | Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years                
Restricted Stock [Member]                    
Allocated Share-based Compensation Expense   $ 2,800 $ 4,700 $ 13,900            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   253,000 277,000 597,000            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options   $ 4,100                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   468,000 505,000              
Restricted Stock [Member] | Minimum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   2 years                
Restricted Stock [Member] | Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years                
Performance Shares [Member]                    
Allocated Share-based Compensation Expense   $ 4,500 $ 1,200              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   354,000   0            
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Shares Issued During Exercise of Instrument, Upper Limit, Percentage   200.00%                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 6,100                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   669,500 368,500 0            
Performance Shares [Member] | Minimum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year                
Performance Shares [Member] | Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years                
Restricted Stock and Performance Shares [Member]                    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense   $ 2,600 $ 2,000              
Common Stock [Member]                    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased             500,000   500,000  
Stock Repurchase Program, Authorized Amount         $ 100,000 $ 50,000        
Stock Repurchased and Retired During Period, Value $ 50,000 $ 463 $ 118 $ 65            
Stock Repurchased and Retired During Period, Shares   4,628,300 1,177,600 650,000            
Treasury Stock Acquired, Average Cost Per Share   $ 19.76 $ 15.68 $ 20.47            
Common Class B [Member]                    
Percentage of Issued and Outstanding Shares                   10.00%