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Note 8 - Accrued Retirement Benefits
 9 Months Ended
Sep. 30, 2018
Notes to Financial Statements  
Pension and Other Postretirement Benefits Disclosure [Text Block]
8
.
ACCRUED RETIREMENT BENEFITS
 
Accrued retirement benefits at
September 30, 2018
and
December 31, 2017
consisted of the following:
 
   
September 30
    
December 31,
  
   
2018
    
2017
  
   
(in thousands)
  
                 
Defined benefit pension plans
   $
5,495
     $
5,812
  
Non-qualified retirement plans
    
2,251
      
2,219
  
Total
    
7,746
      
8,031
  
Less current portion
    
(169
 )    
(164
 )
Non-current portion of accrued retirement benefits
   $
7,577
     $
7,867
  
 
The net periodic benefit costs for pension and postretirement benefits for the
three
and
nine
months ended
September 30, 2018
and
2017
were as follows:
 
   
Three Months
    
Nine Months
  
   
Ended September 30,
    
Ended September 30,
  
   
2018
    
2017
    
2018
    
2017
  
   
(in thousands)
    
(in thousands)
  
Interest cost
   $
495
     $
560
     $
1,485
     $
1,680
  
Expected return on plan assets
    
(578
 )    
(562
 )    
(1,734
 )    
(1,686
 )
Amortization of net loss
    
185
      
204
      
555
      
612
  
Pension and other postretirement expenses
   $
102
     $
202
     $
306
     $
606