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Note 4 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 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 March 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Financial assets:
                               
Deferred compensation plan
  $
5,871
    $
4,900
    $
971
    $
-
 
Derivatives
   
42
     
-
     
42
     
-
 
Total assets
  $
5,913
    $
4,900
    $
1,013
    $
-
 
                                 
Financial liabilities:
                               
Derivatives
  $
(45
)   $
-
    $
(45
)   $
-
 
                                 
As of December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Financial assets:
                               
Deferred compensation plan
  $
6,244
    $
5,251
    $
993
    $
-
 
                                 
Financial liabilities:
                               
Derivatives
  $
(60
)   $
-
    $
(60
)   $
-