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Note 6 - Defined Benefit Plan (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
Pension Benefits
  
   
Six
Months Ended June 30,
  
   
20
17
    
20
16
  
Service cost
  
$
346
     $
348
  
Interest cost
  
 
372
      
378
  
Expected return on plan assets
  
 
(548
)
    
(544
)
Amortization of prior service cost
  
 
(54
)
    
(54
)
Recognized net actuarial loss
  
 
270
      
286
  
Net periodic benefit c
ost
  
$
386
     $
414