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Note 14 - Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 28, 2019
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
(in thousands)
  
Before Tax
amount
    
Tax
(Expense)
Benefit
    
Net of Tax
Amount
  
Year ended December 30, 2017
                        
Foreign currency translation adjustments
   $
11,345
     $
-
     $
11,345
  
Adjustments related to postretirement benefits
    
(1,369
 )    
121
      
(1,248
 )
Change in unrealized gain/loss on investments
    
(2
 )    
-
      
(2
 )
Other comprehensive income (loss)
   $
9,974
     $
121
     $
10,095
  
Year ended December 29, 2018
                        
Foreign currency translation adjustments
   $
(8,905
 )   $
-
     $
(8,905
 )
Adjustments related to postretirement benefits
    
865
      
(60
 )    
805
  
Change in unrealized gain/loss on investments
    
7
      
-
      
7
  
Other comprehensive income (loss)
   $
(8,033
 )   $
(60
 )   $
(8,093
 )
Year ended December 28, 2019
                        
Foreign currency translation adjustments
   $
(7,522
 )   $
-
     $
(7,522
 )
Adjustments related to postretirement benefits
    
(856
 )    
228
      
(628
 )
Other comprehensive income (loss)
   $
(8,378
 )   $
228
     $
(8,150
 )
Condensed Statement of Comprehensive Income [Table Text Block]
(in thousands)
  
2019
    
2018
  
Accumulated net currency translation adjustments
   $
(30,198
 )   $
(22,676
 )
Accumulated net adjustments related to postretirement benefits
    
(3,832
 )    
(3,204
 )
Total accumulated other comprehensive loss
   $
(34,030
 )   $
(25,880
 )