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Note 10 - Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 30, 2017
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 26, 2015
                        
Foreign currency translation adjustments
   $
(11,000
 )   $
-
     $
(11,000
 )
Adjustments related to postretirement benefits
    
(24
 )    
(34
 )    
(58
 )
Other comprehensive income (loss)
   $
(11,024
 )   $
(34
 )   $
(11,058
 )
Year ended December 31, 2016
                        
Foreign currency translation adjustments
   $
(5,789
 )   $
-
     $
(5,789
 )
Adjustments related to postretirement benefits
    
(429
 )    
113
      
(316
 )
Change in unrealized gain/loss on investments
    
(5
 )    
-
      
(5
 )
Other comprehensive income (loss)
   $
(6,223
 )   $
113
     $
(6,110
 )
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
  
Condensed Statement of Comprehensive Income [Table Text Block]
(in thousands)
  
2017
    
2016
  
Accumulated net currency translation adjustments
   $
(13,771
 )   $
(25,116
 )
Accumulated net adjustments related to postretirement benefits
    
(4,009
 )    
(2,761
 )
Accumulated net unrealized gain/loss on investments
    
(7
 )    
(5
 )
Total accumulated other comprehensive loss
   $
(17,787
 )   $
(27,882
 )