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Note 6 - Defined Benefit Plan (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
Pension Benefits
  
   
Nine Months Ended September 30,
  
   
2018
    
2017
  
Service cost
  
$
651
     $
519
  
Interest cost
  
 
600
      
558
  
Expected return on plan assets
  
 
(1,200
)
    
(822
)
Amortization of prior service cost
  
 
(81
)
    
(81
)
Recognized net actuarial loss
  
 
438
      
405
  
Net periodic benefit cost
  
$
408
     $
579