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Note 13 - Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Nine months ended September 30, 2019
(unaudited)
    
Three months ended September 30, 2019
(unaudited)
  
   
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
   $
(1,046
 )   $
(68
 )   $
(1,114
 )   $
17
     $
47
     $
64
  
Other comprehensive income (loss) before reclassifications
    
977
      
354
      
1,331
      
(60
 )    
74
      
14
  
Amounts reclassified from accumulated other comprehensive income (loss)
    
29
      
(268
 )    
(239
 )    
3
      
(103
 )    
(100
 )
Net current period other comprehensive income (loss)
    
1,006
      
86
      
1,092
      
(57
 )    
(29
 )    
(86
 )
Ending balance
   $
(40
 )   $
18
     $
(22
 )   $
(40
 )   $
18
     $
(22
 )
   
Nine months ended September 30, 2018
(unaudited)
    
Three months ended September 30, 2018
(unaudited)
  
   
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
 )   $
(1,342
 )   $
(75
 )   $
(1,417
 )
Other comprehensive income (loss) before reclassifications
    
(726
 )    
(232
 )    
(958
 )    
28
      
18
      
46
  
Amounts reclassified from accumulated other comprehensive income (loss)
    
28
      
232
      
260
      
30
      
57
      
87
  
Net current period other comprehensive income (loss)
    
(698
 )    
—
      
(698
 )    
58
      
75
      
133
  
Ending balance
   $
(1,284
 )   $
—
     $
(1,284
 )   $
(1,284
 )   $
—
     $
(1,284
 )
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 (Loss)
                                   
   
Nine months ended
September 30,
    
Three months ended
September 30,
    
   
2019

(
unaudited)
    
2018

(
unaudited)
    
2019

(
unaudited)
    
2018

(
unaudited)
    
Unrealized gains (losses) on cash flow hedges
   $
5
     $
(5
 )   $
1
     $
(1
 )
Cost of revenues
     
269
      
(225
 )    
104
      
(55
 )
Research and development
     
8
      
(10
 )    
3
      
(3
 )
Sales and marketing
     
22
      
(19
 )    
9
      
(4
 )
General and administrative
     
304
      
(259
 )    
117
      
(63
 )
Total, before income taxes
     
36
      
(27
 )    
14
      
(6
 )
Income tax expense (benefit)
     
268
      
(232
 )    
103
      
(57
 )
Total, net of income taxes
Unrealized gains (losses) on available-for-sale marketable securities
    
(38
 )    
(30
 )    
(3
 )    
(32
 )
Financial income (loss), net
     
(9
 )    
(2
 )    
—
      
(2
 )
Income tax expense (benefit)
     
(29
 )    
(28
 )    
(3
 )    
(30
 )
Total, net of income taxes
    $
239
     $
(260
 )   $
100
     $
(87
 )
Total, net of income taxes