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Note 3 - Marketable Securities
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Cash, Cash Equivalents, and Marketable Securities [Text Block]
NOTE
3:
MARKETABLE SECURITIES
 
The following is a summary of available-for-sale marketable securities at
December 
31,
2017
and
2018:
 
   
As at December 31,
2018
  
   
Amortized

cost
    
Gross
unrealized

gains
    
Gross
unrealized

losses
    
Fair

value
  
Available-for-sale - matures within one year:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Corporate bonds
   $
6,094
     $
—
     $
(32
 )   $
6,062
  
     
6,094
      
—
      
(32
 )    
6,062
  
Available-for-sale - matures after one year through
five
years:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Certificate of deposits
    
747
      
—
      
—
      
747
  
Government bonds
    
501
      
—
      
(5
 )    
496
  
Corporate bonds
    
71,350
      
134
      
(1,320
 )    
70,164
  
     
72,598
      
134
      
(1,325
 )    
71,407
  
                                 
Total
   $
78,692
     $
134
     $
(1,357
 )   $
77,469
  
 
   
As at December 31,
2017
  
   
Amortized

cost
    
Gross
unrealized

gains
    
Gross
unrealized

losses
    
Fair

value
  
Available-for-sale - matures within one year:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Corporate bonds
   $
11,803
     $
3
     $
(12
 )   $
11,794
  
     
11,803
      
3
      
(12
 )    
11,794
  
Available-for-sale - matures after one year through
five
years:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Certificate of deposits
    
747
      
—
      
—
      
747
  
Government bonds
    
501
      
—
      
(6
 )    
495
  
Corporate bonds
    
70,291
      
14
      
(677
 )    
69,628
  
     
71,539
      
14
      
(683
 )    
70,870
  
                                 
Total
   $
83,342
     $
17
     $
(695
 )   $
82,664
  
 
The following table presents gross unrealized losses and fair values for those investments that were in an unrealized loss position as of
December 31, 2017
and
2018,
and the length of time that those investments have been in a continuous loss position:
 
   
Less than 12 months
    
12 months or greater
  
   
Fair Value
    
Gross
unrealized loss
    
Fair Value
    
Gross
unrealized loss
  
As of December 31, 2018
   $
16,580
     $
(192
 )   $
52,590
     $
(1,165
 )
As of December 31, 2017
   $
49,921
     $
(411
 )   $
22,960
     $
(284
 )
 
As of
December 
31,
2017
and
2018,
management believes the impairments are
not
other than temporary and therefore the impairment losses were recorded in accumulated other comprehensive income (loss).
 
The following table presents gross realized gains and losses from sale of available-for-sale marketable securities:
 
   
Year ended December 31,
  
   
2016
    
2017
    
2018
  
                         
Gross realized gains from sale of available-for-sale marketable securities
   $
24
     $
47
     $
4
  
Gross realized losses from sale of available-for-sale marketable securities
   $
(33
 )   $
(47
 )   $
(71
 )