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Note 5 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Total
   
Level 1
   
Level 2
   
Level 3
 
As of June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Financial assets:
                               
Deferred compensation plan
  $
5,762
    $
4,788
    $
974
    $
-
 
Derivatives
   
68
     
-
     
68
     
-
 
Total assets
  $
5,830
    $
4,788
    $
1,042
    $
-
 
                                 
As of December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Financial assets:
                               
Deferred compensation plan
  $
6,244
    $
5,251
    $
993
    $
-
 
                                 
Financial liabilities:
                               
Derivatives
  $
(60
)   $
-
    $
(60
)   $
-