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Note 13 - Shareholders' Equity (Details Textual) - USD ($)
12 Months Ended
Jan. 02, 2016
Dec. 27, 2014
Dec. 28, 2013
Employee Stock Option [Member] | Granted After February 2005 [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercise Period 7 years    
Employee Stock Option [Member] | Granted After February 2005 [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercise Period 10 years    
Employee Stock Option [Member] | Granted After February 2005 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Employee Stock Option [Member] | Maximum [Member] | Granted After February 2005 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Employee Stock Option [Member] | Granted Prior to 2002 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercise Period 10 years    
Employee Stock Option [Member] | Granted in 2002 through February 2005 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercise Period 10 years    
Restricted Stock [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Restricted Stock [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 600,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 5,000,000 $ 9,600,000 $ 15,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 8,100,000 7,600,000 6,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid 400,000 300,000 100,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 13,200,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 328 days    
Allocated Share-based Compensation Expense $ 10,700,000 9,400,000 8,900,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 3,700,000 3,300,000 3,200,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Post-retirement Benefit Plans, Liability Adjustment Tax 661,000 12,587,000 6,549,000
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax $ 0 $ 0 $ 0
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 1,000,000    
Stock Repurchased During Period, Shares 350,000    
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 650,000