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Note 10 - Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
 
 
Three Months Ended June 30,
 
 
Six Months Ended June 30,
 
 
 
2017
 
 
2016
 
 
2017
 
 
2016
 
(Amounts in thousands)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
  $
58
    $
45
    $
116
    $
92
 
Interest cost
   
93
     
95
     
186
     
191
 
Amortization of prior service cost
   
57
     
56
     
114
     
113
 
Amortization of losses
   
8
     
9
     
15
     
23
 
Net periodic cost
  $
216
    $
205
    $
431
    $
419