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Note 6 - Benefit Plans (Tables)
 3 Months Ended
Apr. 01, 2017
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
 
 
For the Three Months Ended
 
(in
thousands
)
 
April 1, 2017
 
 
April 2, 2016
 
Components of net periodic benefit cost:
                
Service cost
   $
408
     $
332
  
Interest cost
    
360
      
497
  
Expected return on plan assets
    
(476
 )    
(520
 )
Amortization of prior service (credit)
    
84
      
73
  
Total cost of the plan
    
376
      
382
  
Expected plan participants’ contribution
    
—
      
—
  
Net periodic benefit cost
   $
376
     $
382