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Note 15 - Employee Benefit Plans (Details Textual)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Jan. 01, 2017
USD ($)
Jan. 03, 2016
USD ($)
Defined Contribution Plan Eligibility Period 180 days    
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax $ 56,554 $ 54,862  
Foreign Plan [Member]      
Defined Benefit Plan, Plan Assets, Contributions by Employer 2,812 4,991  
Pension Cost (Reversal of Cost) 1,900 1,200 $ 2,100
Defined Benefit Plan, Funded (Unfunded) Status of Plan (13,382) (19,448)  
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax $ 47,972 49,236  
Number of Defined Benefit Plans 2    
Defined Benefit Plan, Expected Amortization, Next Fiscal Year $ 1,200    
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax 7,000    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax 5,800    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax (1,200)    
Defined Benefit Plan, Indexation Benefit 32,700 32,200  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 3,300    
Defined Benefit Plan, Accumulated Benefit Obligation 313,257 274,414  
Foreign Plan [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
AOCI Tax, Attributable to Parent 15,000    
UNITED STATES      
Defined Benefit Plan, Plan Assets, Contributions by Employer 1,900    
Defined Benefit Plan, Expected Amortization, Next Fiscal Year 500    
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax 1,700    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax (2,000)    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax $ (300)    
Normal Retirement Age 65    
Early Retirement Age 55    
Minimum Period Of Service For Entitlement In Plan 15 years    
Minimum Period Under Death Benefit Feature 10 years    
Maximum Period For Death Benefits Payable To Designated Beneficiary 10 years    
Defined Benefit Plan, Accumulated Benefit Obligation $ 31,900 29,700  
Other Comprehensive Income (Loss), Increase in Minimum Pension Liability 1,300    
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]      
Deferred Compensation Liability, Current and Noncurrent 31,900    
Investment in Insurance Instruments 28,000    
The 401(k) Plan [Member]      
Defined Benefit Plan, Plan Assets, Contributions by Employer 3,000 3,100 2,900
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 0 $ 0 $ 0