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Note 6 - Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
For the Three Months Ended
    
For the
Nine
Months Ended
  
(in thousands)
  
September
30
,
2017
    
October 1
,
2016
    
September
30
,
2017
    
October 1
,
2016
  
Components of net periodic benefit cost:
                                
Service cost
   $
408
     $
332
     $
1,224
     $
997
  
Interest cost
    
360
      
496
      
1,080
      
1,489
  
Expected return on plan assets
    
(476
 )    
(520
 )    
(1,428
 )    
(1,560
 )
Amortization
, net
    
84
      
74
      
252
      
220
  
Net periodic benefit cost
   $
376
     $
382
     $
1,128
     $
1,146