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Note 10 - Financial Expenses, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule Of Nonoperating Income, by Component [Table Text Block]
 
 
Year ended
December 31,
 
 
2017
 
2016
 
2015
Financial income:                        
Interest on bank deposits, net   $
747
     $
520
     $
330
  
Foreign currency transactions gains, net    
1,773
      
—
      
—
  
Other    
27
      
—
      
—
  
     
2,547
      
520
      
330
  
                         
Financial expenses:                        
Bank charges    
185
      
149
      
95
  
Foreign currency transactions losses, net    
—
      
1,224
      
1,711
  
Other    
—
      
32
      
47
  
     
(185
 )    
(1,405
 )    
(1,853
 )
    $
2,362
     $
(885
 )   $
(1,523
 )