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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
12 Months Ended
Oct. 01, 2017
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     77,000 697,000 875,000
Allowance for Doubtful Accounts Receivable, Current     $ 200,000 $ 100,000  
Valuation Allowances and Reserves, Additions for Charges to Cost and Expense     1,100,000 1,100,000 $ 2,400,000
Depreciation     $ 5,000,000 3,500,000 4,200,000
Number of Operating Segments     1    
Goodwill and Intangible Asset Impairment $ 0        
Percentage of Revenue Recognized upon Customer Acceptance     20.00%    
Percentage of Revenue Recognized upon Shipment and Passage of Title     80.00%    
Deferred Revenue     $ 10,400,000 9,300,000  
Deferred Profit     7,400,000    
Other Deferred Credits, Current     6,608,000 6,886,000  
Foreign Currency Transaction Gain (Loss), Realized     3,000,000 2,600,000 1,400,000
Accumulated Other Comprehensive Income (Loss), Net of Tax     (17,787,000) (27,882,000)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax     11,300,000 (5,800,000)  
Adjustments for New Accounting Principle, Early Adoption [Member]          
Cumulative Effect of New Accounting Principle in Period of Adoption         200,000
Adjustments for New Accounting Principle, Early Adoption [Member] | Retained Earnings [Member]          
Cumulative Effect of New Accounting Principle in Period of Adoption       $ (200,000) $ (249,000) [1]
Accounting Standards Update 2014-09 [Member] | Scenario, Forecast [Member]          
Cumulative Effect on Retained Earnings, before Tax   $ 1,300,000      
Cumulative Effect on Retained Earnings, Tax   $ 200,000      
Non-current Other Accrued Liabilities [Member]          
Deferred Profit Recognized After Year One     $ 800,000    
Minimum [Member]          
Standard Product Warranty Term     1 year    
Maximum [Member]          
Standard Product Warranty Term     3 years    
Building [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life     30 years    
Building [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life     40 years    
Building Improvements [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life     5 years    
Building Improvements [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life     15 years    
Machinery, Equipment and Software [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life     3 years    
Machinery, Equipment and Software [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life     10 years    
[1] Cumulative effect of accounting change relates to our adoption of ASU 2016-09. Please refer to Note 1 of the Consolidated Financial Statements for further detail on the adoption of this accounting standard.