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Note 6 - Defined Benefit Plan (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
Pension Benefits
   
Nine Months Ended September 30,
   
2019
  
2018
Service cost
  
$
600
     $
651
  
Interest cost
  
 
663
      
600
  
Expected return on plan assets
  
 
(1,095
)
    
(1,200
)
Amortization of prior service cost
  
 
(81
)
    
(81
)
Recognized net actuarial loss
  
 
474
      
438
  
Net periodic benefit cost
  
$
561
     $
408