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Note 7 - Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
For the Three Months Ended
 
(in thousands)
 
March 31
,
201
8
   
April 1
,
201
7
 
Components of net periodic benefit cost:
               
Service cost
  $
533
    $
408
 
Interest cost
   
501
     
360
 
Expected return on plan assets
   
(540
)    
(476
)
Amortization, net
   
74
     
84
 
Net periodic benefit cost
  $
568
    $
376