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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Jan. 01, 2017
Jan. 03, 2016
Dec. 28, 2014
Research and Development Expense $ 14,300 $ 14,500 $ 13,900
Accrual for Environmental Loss Contingencies 0 0  
Interest Paid 5,500 4,800 21,000
Income Taxes Paid 12,800 7,200 7,500
Proceeds from Income Tax Refunds 200 3,100 5,000
Interest Costs Capitalized 500 300 800
Depreciation 30,100 30,400 30,300
Finite-Lived Intangible Assets, Accumulated Amortization 77,300 77,300  
Goodwill, Impaired, Accumulated Impairment Loss 212,600 212,600  
Goodwill 61,218 63,890  
Other Intangible Assets, Net 900 4,800  
Amortization of Intangible Assets $ 500 300 300
Fair Value Estimates of Reporting Units, Threshold for No Goodwill Impairment, Percent of Decrease in Fair Value Estimates 10.00%    
Product Warranty Period Lower Range 10 years    
Product Warranty Period Upper Range 20 years    
Workmanship Warranty Period 1 year    
Warranty and Sales Allowances Payable, Current $ 5,529 4,759  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax (19,000) (32,600) (28,400)
Allowance for Doubtful Accounts Receivable 3,800 4,500  
Cash Equivalents, at Carrying Value 0 0  
Short-term Investments 0 0  
Goodwill, Impairment Loss $ 0 $ 0 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 0 0
Restructuring and Asset Impairment Charges [Member]      
Capitalized Patent Defense Costs, Impairment $ 3,400    
Building and Building Improvements [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life 10 years    
Building and Building Improvements [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life 40 years    
Furniture and Equipment [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life 3 years    
Furniture and Equipment [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life 12 years