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Note 2 - Marketable Securities
 12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
2.
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 shareholders’ 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 security at
December 31, 2017
and
2016
were as follows:
 
   
Amortized
cost
    
Gross unrealized
holding
gains
    
Gross unrealized
holding
losses
    
Estimated fair value
  
December 31,
2017
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Available-for-sale securities:
                                
Corporate bonds and notes
   $
8,458
     $
19
     $
(49
)
   $
8,428
  
Municipal bonds
    
4,637
      
1
      
(28
)
    
4,610
  
Total available-for-sale securities
   $
13,095
     $
20
     $
(77
)
   $
13,038
  
                                 
December 31,
2016
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Available-for-sale securities:
                                
Corporate bonds and notes
   $
20,028
     $
64
     $
(122
)
   $
19,970
  
Municipal bonds
    
6,463
      
6
      
(44
)
    
6,425
  
Total available-for-sale securities
   $
26,491
     $
70
     $
(166
)
   $
26,395
  
 
Maturities of marketable securities classified as available-for-sale securities were as follows at
December 31, 2017:
 
   
Amortized
    
Estimated
  
   
cost
    
fair value
  
                 
Due within one year
   $
2,688
     $
2,688
  
Due after one year through five years
    
10,408
      
10,350
  
Total available-for-sale securities
   $
13,096
     $
13,038
  
 
Debt securities in an unrealized loss position as of
December 31, 2017
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. The available-for-sale marketable securities in a gross unrealized loss position as of
December 31, 2017
are summarized 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 December 31,
2017
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Corporate bonds and notes
   $
3,799
     $
(20
)
    
2,125
     $
(30
)
   $
5,924
     $
(50
)
Municipal bonds
    
3,341
      
(18
)
    
657
      
(9
)
    
3,998
      
(27
)
    $
7,140
     $
(38
)
   $
2,782
     $
(39
)
   $
9,922
     $
(77
)