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Note 6 - Marketable Securities
 9 Months Ended
Sep. 30, 2019
Notes to Financial Statements  
Cash, Cash Equivalents, and Marketable Securities [Text Block]
NOTE
6
: MARKETABLE SECURITIES
 
The following is a summary of available-for-sale marketable securities:
 
   
September 30, 2019 (Unaudited)
  
   
Amortized

cost
    
Gross
unrealized

gains
    
Gross
unrealized

losses
    
Fair

value
  
Available-for-sale - matures within one year:
    
 
 
 
  
 
 
 
  
 
 
 
Corporate bonds
   $
17,245
     $
13
     $
(30
 )   $
17,228
  
     
17,245
      
13
      
(30
 )    
17,228
  
Available-for-sale - matures after one year through five years:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Government bonds
    
501
      
—
      
(1
 )    
500
  
Corporate bonds
    
52,770
      
162
      
(198
 )    
52,734
  
     
53,271
      
162
      
(199
 )    
53,234
  
                                 
Total
   $
70,516
     $
175
     $
(229
 )   $
70,462
  
 
 
   
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
  
 
 
The following table presents gross unrealized losses and fair values for those investments that were in an unrealized loss position as of
September 30, 2019
and
December 31, 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 September 30, 2019 (unaudited)
   $
12,974
     $
(110
 )   $
30,835
     $
(119
 )
As of December 31, 2018
   $
16,580
     $
(192
 )   $
52,590
     $
(1,165
 )
 
As of
September 30, 2019
and
December 31, 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:
 
   
Nine months ended

September 30,
    
Three months ended

September 30,
  
   
2019
(unaudited)
    
2018
(unaudited)
    
2019
(unaudited)
    
2018
(unaudited)
  
                                 
Gross realized gains from sale of available-for-sale marketable securities
   $
1
     $
4
     $
1
     $
—
  
Gross realized losses from sale of available-for-sale marketable securities
   $
(39
 )   $
(34
 )   $
(4
 )   $
(32
 )