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Note 12 - Selected Statements of Income Data
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Interest and Other Income [Text Block]
NOTE
12:
SELECTED STATEMENTS OF INCOME DATA
 
a. Financial income, net:
 
   
Year ended December 31,
  
   
2016
    
2017
    
2018
  
                         
Interest income
   $
3,300
     $
4,233
     $
4,499
  
Loss on available-for-sale marketable securities, net
    
(9
 )    
—
      
(67
 )
Amortization of premium on available-for-sale marketable securities, net
    
(1,064
 )    
(1,179
 )    
(773
 )
Foreign exchange loss, net
    
(188
 )    
(28
 )    
(241
 )
Total
   $
2,039
     $
3,026
     $
3,418
  
 
b
.
Revaluation of
investment in other company
:
 
The Company recorded a loss of
$870
in
2018
related to revaluation of its investment in other company, in which it holds at cost.
 
The following table summarizes the total carrying value of the Company’s investment in other company held as of
December 
31,
2018
including cumulative unrealized downward adjustments made to the initial cost basis of the investment:
 
Initial cost basis
   $
1,806
  
Downward adjustments
    
(870
 )
Total carrying value at the end of the period
   $
936