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Note 10 - Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months Ended September 30,
   
Nine Months Ended September 30,
 
   
2017
   
2016
   
2017
   
2016
 
(Amounts in thousands)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
  $
57
    $
46
    $
173
    $
138
 
Interest cost
   
93
     
95
     
279
     
286
 
Amortization of prior service cost
   
57
     
57
     
171
     
170
 
Amortization of losses
   
8
     
12
     
23
     
35
 
Net periodic cost
  $
215
    $
210
    $
646
    $
629