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Note 10 - Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Year ended December 31,
2017
    
Year ended December 31,
201
8
  
   
Unrealized
gains (losses) on available-for-sale marketable
securities
    
Unrealized gains (losses) on cash flow
hedges
    
Total
    
Unrealized
gains (losses) on available-for-sale marketable
securities
    
Unrealized gains (losses) on cash flow
hedges
    
Total
  
                                                 
Beginning balance
   $
(502
 )   $
5
     $
(497
 )   $
(586
 )   $
—
     $
(586
 )
Other comprehensive income (loss) before reclassifications
    
(83
 )    
163
      
80
      
(521
 )    
(380
 )    
(901
 )
Amounts reclassified from accumulated other comprehensive income (loss)
    
(1
 )    
(168
 )    
(169
 )    
61
      
312
      
373
  
Net current period other comprehensive income (loss)
    
(84
 )    
(5
 )    
(89
 )    
(460
 )    
(68
 )    
(528
 )
Ending balance
   $
(586
 )   $
—
     $
(586
 )   $
(1,046
 )   $
(68
 )   $
(1,114
 )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Details about Accumulated
Other Comprehensive Income
(Loss) Components
  
Amount Reclassified from Accumulated
Other Comprehensive Income (Loss)
    
Affected Line Item in the
Statements of Income
                             
   
Year ended December 31,
      
   
2016
    
2017
    
2018
      
Unrealized gains (losses) on cash flow hedges
   $
4
     $
4
     $
(7
 )  
Cost of revenues
     
132
      
162
      
(308
 )  
Research and development
     
12
      
10
      
(13
 )  
Sales and marketing
     
13
      
13
      
(26
 )  
General and administrative
     
161
      
189
      
(354
 )  
Total, before income taxes
     
18
      
21
      
(42
 )  
Income tax expense
     
143
      
168
      
(312
 )  
Total, net of income taxes
                             
Unrealized gains (losses) on available-for-sale marketable securities
    
(9
 )    
—
      
(67
 )  

Financial income, net
     
(1
 )    
(1
 )    
(6
 )  
Income tax benefit
     
(8
 )    
1
      
(61
 )  
Total, net of income taxes
                             
    $
135
     $
169
     $
(373
 )  
Total, net of income taxes