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Note 4 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2017
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 September 30, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Financial assets:
                               
Deferred compensation plan
  $
6,230
    $
5,352
    $
878
    $
-
 
                                 
Financial liabilities:
                               
Derivatives
  $
(70
)   $
-
    $
(70
)   $
-
 
                                 
As of December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Financial assets:
                               
Deferred compensation plan
  $
6,209
    $
5,215
    $
994
    $
-
 
Derivatives
   
58
     
-
     
58
     
-
 
Total assets
  $
6,267
    $
5,215
    $
1,052
    $
-
 
                                 
Financial liabilities:
                               
Derivatives
  $
(8
)   $
-
    $
(8
)   $
-