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Note 11 - Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Year ended December 31,
2018
    
Year ended December 31,
2019
  
   
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
   $
(586
 )   $
—
     $
(586
 )   $
(1,046
 )   $
(68
 )   $
(1,114
 )
Other comprehensive income (loss) before reclassifications
    
(521
 )    
(380
 )    
(901
 )    
1,072
      
388
      
1,460
  
Amounts reclassified from accumulated other comprehensive income (loss)
    
61
      
312
      
373
      
19
      
(271
 )    
(252
 )
Net current period other comprehensive income (loss)
    
(460
 )    
(68
 )    
(528
 )    
1,091
      
117
      
1,208
  
Ending balance
   $
(1,046
 )   $
(68
 )   $
(1,114
 )   $
45
     $
49
     $
94
  
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,
      
   
2017
    
2018
    
2019
      
Unrealized gains (losses) on cash flow hedges
   $
4
     $
(7
 )   $
5
    
Cost of revenues
     
162
      
(308
 )    
272
    
Research and development
     
10
      
(13
 )    
8
    
Sales and marketing
     
13
      
(26
 )    
22
    
General and administrative
     
189
      
(354
 )    
307
    
Total, before income taxes
     
21
      
(42
 )    
36
    
Income tax expense (benefit)
     
168
      
(312
 )    
271
    
Total, net of income taxes
                             
Unrealized gains (losses) on available-for-sale marketable securities
    
—
      
(67
 )    
(28
 )  
Financial income, net
     
(1
 )    
(6
 )    
(9
 )  
Income tax benefit
     
1
      
(61
 )    
(19
 )  
Total, net of income taxes
                             
    $
169
     $
(373
 )   $
252
    
Total, net of income taxes