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Note D - Marketable Equity Securities (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Marketable Securities [Table Text Block]
   
June 30, 2018
   
December 31, 2017
 
   
(in thousands)
 
Fair market value
  $
27,860
    $
26,664
 
Cost
   
20,959
     
16,640
 
Unrealized gain
  $
6,901
    $
10,024
 
Unrealized Gain (Loss) on Investments [Table Text Block]
   
June 30, 2018
   
December 31, 2017
 
   
(in thousands)
 
Gross unrealized gains
  $
7,983
    $
10,150
 
Gross unrealized losses
   
1,082
     
126
 
Net unrealized gains
  $
6,901
    $
10,024
 
Schedule of Realized Gain (Loss) [Table Text Block]
   
Three Months Ended
   
Six Months Ended
 
   
June 30,
   
June 30,
 
   
2018
   
2017
   
2018
   
2017
 
 
 
(in thousands)
 
Realized gain      
Sales proceeds
  $
-
    $
711
    $
-
    $
3,079
 
Cost of securities sold
   
-
     
349
     
-
     
934
 
Realized gain
  $
-
    $
362
    $
-
    $
2,145
 
                                 
Realized gain, net of taxes
  $
-
    $
222
    $
-
    $
1,314