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Note 2 - Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Useful Life of Property and Equipment [Table Text Block]
   
%
    
Mainly %
  
                   
Computers and equipment
  
 20
 –
33
      
33
  
Office furniture and equipment
  
 7
 –
15
      
15
  
Leasehold improvements
  
see below
  
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]
   
Gains (losses) on derivatives
recognized in OCI
  
   
Year ended December 31,
  
   
201
9
    
2018
    
2017
  
                         
Foreign exchange forward contracts and put and call options
   $
108
     $
(19
 )   $
163
  
Derivative Instruments, Gain (Loss) [Table Text Block]
     
Gains (losses) on derivatives reclassified
from OCI to income
 
     
Year ended December 31,
  
 
Location
  
201
9
    
2018
    
2017
  
                           
Foreign exchange forward contracts and put and call options
Operating expenses
   $
105
     $
(16
 )   $
172
  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Unrealized
gains (losses)
on available-
for-sale
marketable
securities
    
Unrealized
gains (losses)
on Cash Flow
Hedges
    
Unrealized
gains (losses) on
components of
defined benefit
plans
    
Unrealized
gains (losses)
on foreign
currency
translation
    
Total
  
January 1, 2019
   $
(1,633
 )   $
(3
 )   $
(361
 )   $
(327
 )   $
(2,324
 )
Other comprehensive income (loss) before reclassifications
    
1,494
      
108
      
(141
 )    
(10
 )    
1,451
  
Losses (gains) reclassified from accumulated other comprehensive income (loss)
    
73
      
(105
 )    
16
      
-
      
(16
 )
Net current period other comprehensive income (loss)
    
1,567
      
3
      
(125
 )    
(10
 )    
1,435
  
                                         
December 31, 2019
   $
(66
 )   $
-
     $
(486
 )   $
(337
 )   $
(889
 )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Details about Accumulated Other Comprehensive Income Components
  
Losses (gains)
reclassified from
accumulated
other
comprehensive
income
  
Affected Line Item in the
Statement of Income (Loss)
           
Losses on available-for-sale marketable securities
   $
73
  
Financial income, net
     
-
  
Provision for income taxes
     
73
  
Total, net of income taxes
           
Gains on cash flow hedges
          
     
(83
 )
Research and development
           
     
(8
 )
Sales and marketing
     
(14
 )
General and administrative
     
(105
 )
Total, before income taxes
     
-
  
Provision for income taxes
     
(105
 )
Total, net of income taxes
           
Losses on components of defined benefit plans
    
11
  
Research and development
     
5
  
Sales and marketing
     
16
  
Total, before income taxes
     
-
  
Provision for income taxes
     
16
  
Total, net of income taxes
           
Total reclassifications for the period
    
(16
 )
Total, net of income taxes