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Note 2 - Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
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 New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
   
For the year ended December 31, 2018
  
   
As
Reported
    
Prior to
Adoption of
ASC 606
    
Effect of Change
Higher/(Lower)
  
Income statement
  
 
 
 
  
 
 
 
  
 
 
 
                         
Revenues
   $
117,438
     $
117,127
     $
311
  
Cost of revenues
    
59,991
      
59,884
      
107
  
Gross margin:
    
57,447
      
57,243
      
204
  
Operating expenses:
                        
Research and development, net
    
36,109
      
36,109
      
-
  
Sales and marketing
    
15,323
      
15,307
      
16
  
General and administrative
    
9,955
      
9,955
      
-
  
Intangible assets amortization
    
1,700
      
1,700
      
-
  
Total operating expenses:
    
63,087
      
63,071
      
16
  
Operating loss:
    
(5,640
 )    
(5,828
 )    
188
  
Financial income
    
1,815
      
1,815
      
-
  
Loss before taxes on income
    
(3,825
 )    
(4,013
 )    
188
  
Taxes on income
    
1,868
      
1,868
      
-
  
Net income (loss)
   $
(1,957
 )   $
(2,145
 )   $
188
  
   
December 31, 2018
  
   
As
Reported
    
Prior to
Adoption of
ASC 606
    
Effect of
Change
Higher/(Lower)
  
Balance Sheet
  
 
 
 
  
 
 
 
  
 
 
 
Assets
  
 
 
 
  
 
 
 
  
 
 
 
Trade receivables
   $
13,475
     $
13,048
     $
427
  
Inventories
    
9,819
      
9,943
      
(124
 )
Other accounts receivable and prepaid expenses
    
3,670
      
3,691
      
(21
 )
                         
Liabilities
  
 
 
 
  
 
 
 
  
 
 
 
Accrued expenses and other accounts payable
    
(3,461
 )    
(3,461
 )    
-
  
                         
                         
Equity
  
 
 
 
  
 
 
 
  
 
 
 
Accumulated deficit
    
(112,363
 )    
(112,645
 )    
282
  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
       
Fair value of
derivative instruments
  
Derivative assets
      
December 31,
  
(liabilities) designated as hedging
  
Balance sheet location
  
201
8
    
201
7
  
                     
Foreign exchange forward contracts and put and call options
  
Other accounts receivable and prepaid expenses (Accrued expenses and other accounts payable)
   $
(3
 )   $
-
  
                     
   
Total
   $
(3
 )   $
-
  
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]
   
Gains (losses) on derivatives
recognized in OCI
  
   
Year ended December 31,
  
   
2018
    
201
7
    
201
6
  
                         
Foreign exchange forward contracts and put and call options
   $
(19
 )   $
163
     $
45
  
Derivative Instruments, Gain (Loss) [Table Text Block]
       
Gains (losses) on derivatives reclassified
from OCI to income
 
       
Year ended December 31,
  
   
Location
  
201
8
    
201
7
    
201
6
  
                             
Foreign exchange forward contracts and put and call options
  
Operating expenses
   $
(16
 )   $
172
     $
1
  
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, 2018
   $
(1,209
 )   $
-
     $
(409
 )   $
(256
 )   $
(1,874
 )
Other comprehensive income (loss) before reclassifications
    
(465
 )    
(19
 )    
29
      
(71
 )    
(526
 )
Losses (gains) reclassified from accumulated other comprehensive income (loss)
    
41
      
16
      
19
      
-
      
76
  
Net current period other comprehensive income (loss)
    
(424
 )    
(3
 )    
48
      
(71
 )    
(450
 )
                                         
December 31, 2018
   $
(1,633
 )   $
(3
 )   $
(361
 )   $
(327
 )   $
(2,324
 )
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
Statement of
Income
(Loss)
           
Losses on available-for-sale marketable securities
   $
41
  
Financial income, net
     
-
  
Provision for income taxes
     
41
  
Total, net of income taxes
           
Losses on cash flow hedges
          
     
13
  
Research and development
     
1
  
Sales and marketing
     
2
  
General and administrative
     
16
  
Total, before income taxes
     
-
  
Provision for income taxes
     
16
  
Total, net of income taxes
           
Losses on components of defined benefit plans
    
12
  
Research and development
     
7
  
Sales and marketing
     
19
  
Total, before income taxes
     
-
  
Provision for income taxes
     
19
  
Total, net of income taxes
           
Total reclassifications for the period
    
76
  
Total, net of income taxes