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Note 13 - Taxes on Income (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended 24 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Dec. 31, 2017
Dec. 21, 2017
Dec. 28, 2014
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   35.00% 35.00% 35.00%      
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount   $ 11,707 $ 0 $ 0      
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   3,500          
Deferred Tax Assets, Operating Loss Carryforwards, Foreign   3,800     $ 3,800    
Operating Loss Carryforwards, Valuation Allowance   1,186 2,500   1,186    
Increase (Decrease) in Deferred Tax Assets   $ (3,300) $ (5,000)        
Effective Income Tax Rate Reconciliation, Percent   47.00% 31.60% 31.50%      
Deferred Tax Liabilities, Undistributed Foreign Earnings   $ 0 $ 1,481   0    
Unrecognized Tax Benefits   29,221 27,888 $ 28,271 29,221   $ 27,301
Unrecognized Tax Benefits that Would Impact Effective Tax Rate   29,200     29,200    
Unrecognized Tax Benefits That Would Require To Settle Through Cash   25,900     25,900    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued   1,600     1,600    
Discontinued Operations [Member]              
Deferred Tax Assets, Operating Loss Carryforwards, State and Local   57,300     57,300    
Domestic Tax Authority [Member]              
Operating Loss Carryforwards, Share-based Compensation   23,200 $ 9,000   23,200    
Income Tax Benefit, Share-based Payment Awards   8,100          
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net         3,200    
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation   $ 3,100          
Domestic Tax Authority [Member] | Earliest Tax Year [Member]              
Open Tax Year   2003          
State and Local Jurisdiction [Member]              
Operating Loss Carryforwards, Share-based Compensation   $ 21,400     21,400    
Income Tax Benefit, Share-based Payment Awards   1,300          
Operating Loss Carryforwards   108,600     108,600    
Operating Loss Carryforwards, Valuation Allowance   $ 18,500     18,500    
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]              
Open Tax Year   2012          
Foreign Tax Authority [Member] | Earliest Tax Year [Member]              
Open Tax Year   2006          
Foreign Tax Authority [Member] | Foreign Tax Authorities Excluding Canada [Member]              
Undistributed Earnings of Foreign Subsidiaries   $ 307,000     307,000 $ 350,000  
Repatriation Amount Previously Deemed Indefinitely Reinvested Earnings   37,000     37,000    
Provisional Estimate For Foreign Withholding and US State Taxes   600          
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]              
Repatriation Amount Previously Deemed Indefinitely Reinvested Earnings   6,000     6,000    
Deferred Tax Liabilities, Undistributed Foreign Earnings   2,000     2,000    
Foreign Withholding Taxes Related to Undistributed Earnings Not Deemed Indefinitely Reinvested   300     $ 300    
Deferred Income Taxes On Undistributed Earnings Not Deemed Indefinitely Reinvested, Reversal Amount   $ (2,000)          
Scenario, Forecast [Member]              
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%