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Note 10 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
As of December 31, 2018
 
Total
   
Level 1
   
Level 2
   
Level 3
 
Financial assets:
                               
Deferred compensation plan
  $
4,719
    $
3,925
    $
794
    $
-
 
Foreign currency forward contracts
   
101
     
-
     
101
     
-
 
Total financial assets
  $
4,820
    $
3,925
    $
895
    $
-
 
                                 
As of December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Financial assets:
                               
Deferred compensation plan
  $
6,244
    $
5,251
    $
993
    $
-
 
                                 
Financial liabilities:
                               
Foreign currency forward contracts
  $
(60
)   $
-
    $
(60
)   $
-