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Note D - Marketable Equity Securities (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Marketable Securities [Table Text Block]
   
March 31, 2019
   
December 31, 2018
 
   
(in thousands)
 
Fair market value
  $
30,805
    $
27,549
 
Cost
   
26,000
     
25,602
 
Unrealized gain
  $
4,805
    $
1,947
 
Unrealized Gain (Loss) on Investments [Table Text Block]
   
March 31, 2019
   
December 31, 2018
 
   
(in thousands)
 
Gross unrealized gains
  $
7,129
    $
5,668
 
Gross unrealized losses
   
2,324
     
3,721
 
Net unrealized gains
  $
4,805
    $
1,947