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Note 11 - Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2016
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 27, 2014
                        
Foreign currency translation adjustments
   $
(14,107
 )   $
-
     $
(14,107
 )
Adjustments related to postretirement benefits
    
(3,809
 )    
551
      
(3,258
 )
Other comprehensive income (loss)
   $
(17,916
 )   $
551
     $
(17,365
 )
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
 )
Condensed Statement of Comprehensive Income [Table Text Block]
(in thousands)
  
2016
   
2015
 
Accumulated net currency translation adjustments
   $
(25,116
 )   $
(19,327
 )
Accumulated net adjustments related to postretirement benefits
    
(2,761
 )    
(2,445
 )
Accumulated net unrealized gain/loss on investments
    
(5
 )    
-
  
Total accumulated other comprehensive loss
   $
(27,882
 )   $
(21,772
 )