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Note 6 - Defined Benefit Plan (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
Pension Benefits
  
   
Three Months Ended March 31,
  
   
2018
    
2017
  
Service cost
  
$
217
     $
173
  
Interest cost
  
 
200
      
186
  
Expected return on plan assets
  
 
(400
)
    
(274
)
Amortization of prior service cost
  
 
(27
)
    
(27
)
Recognized net actuarial loss
  
 
146
      
135
  
Net periodic benefit cost
  
$
136
     $
193