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Note 2 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
    As of March 31, 2017
(unaudited)
  As of December 31, 2016
    Level
I
 
Level
II
  Level
III
  Fair
Value
  Level
I
 
Level
II
  Level
III
  Fair
Value
Financial assets:                                                                
Forward foreign exchange contracts          
1,645
           
1,645
           
           
 
Financial liabilities:                                                                
Forward foreign exchange contracts          
           
           
(479
)          
(479
)
Total financial assets (liabilities)   $     $
1,645
    $     $
1,645
    $     $
(479
)   $     $
(479
)