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Note 4 - Marketable Securities
 3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
4.
Marketable Securities
 
The Company has classified its marketable securities as available-for-sale securities. These securities are carried at estimated fair value with unrealized holding gains and losses included in accumulated other comprehensive income (loss) in stockholders’ equity until realized. Gains and losses on marketable security transactions are reported on the specific-identification method. Dividend and interest income are recognized when earned.
 
The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of securities at
March 31, 2019
and
December 31, 2018
were as follows:
 
   
Amortized
cost
    
Gross unrealized
holding
gains
    
Gross unrealized
holding
losses
    
Estimated fair value
  
March 31, 2019
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Available-for-sale securities:
                                
Corporate bonds and notes
   $
5,465
     $
37
     $
(12
)
   $
5,490
  
Municipal bonds
    
3,634
      
6
      
(7
)
    
3,633
  
Total available-for-sale securities
   $
9,099
     $
43
     $
(19
)
   $
9,123
  
                                 
December 31, 2018
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Available-for-sale securities:
                                
Corporate bonds and notes
   $
2,911
     $
1
     $
(31
)
   $
2,881
  
Municipal bonds
    
1,849
      
—
      
(15
)
    
1,834
  
Total available-for-sale securities
   $
4,760
     $
1
     $
(46
)
   $
4,715
  
 
 Maturities of marketable securities classified as available-for-sale securities were as follows at
March 31, 2019:
 
   
Amortized cost
    
Estimated fair value
  
Due within one year
   $
2,888
     $
2,888
  
Due after one year through five years
    
6,059
      
6,080
  
Due after five years
    
152
      
155
  
Total available-for-sale securities
   $
9,099
     $
9,123
  
 
Debt securities in an unrealized loss position as of
March 31, 2019
were
not
deemed impaired at acquisition and subsequent declines in fair value are
not
deemed attributed to declines in credit quality. Management believes that it is more likely than
not
that the securities will receive a full recovery of par value, although there can be
no
assurance that such recovery will occur. The available-for-sale marketable securities with continuous gross unrealized loss position for less than
12
months and
12
months or greater and their related fair values were as follows:
 
   
Less than 12 months
    
More than 12 months
    
Total
  
   
Estimated fair value
    
Gross unrealized holding losses
    
Estimated fair value
    
Gross unrealized holding losses
    
Estimated fair value
    
Gross unrealized holding losses
  
As of March 31, 201
9
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Corporate bonds and notes
   $
104
     $
(1
)
   $
5,386
     $
(11
)
   $
5,490
     $
(12
)
Municipal bonds
    
—
      
—
      
3,633
      
(7
)
    
3,633
      
(7
)
Total
   $
104
     $
(1
)
   $
9,019
     $
(18
)
   $
9,123
     $
(19
)