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Note 6 - Defined Benefit Plan (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
Pension Benefits
  
   
Nine
Months Ended September 30,
  
   
20
17
    
20
16
  
Service cost
  
$
519
     $
522
  
Interest cost
  
 
558
      
567
  
Expected return on plan assets
  
 
(822
)
    
(816
)
Amortization of prior service cost
  
 
(81
)
    
(81
)
Recognized net actuarial loss
  
 
405
      
429
  
Net periodic benefit c
ost
  
$
579
     $
621