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Note C - Marketable Equity Securities (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Marketable Securities [Table Text Block]
   
March 31, 2017
    
December 31, 2016
  
   
(in thousands)
  
Fair market value
   $
25,520
     $
27,621
  
Cost
    
14,955
      
15,569
  
Net unrealized gains
   $
10,565
     $
12,052
  
Unrealized Gain (Loss) on Investments [Table Text Block]
   
March 31, 2017
    
December 31, 2016
  
   
(in thousands)
  
Gross unrealized gains
   $
10,686
     $
12,161
  
Gross unrealized losses
    
121
      
109
  
Net unrealized gains
   $
10,565
     $
12,052
  
Schedule of Realized Gain (Loss) [Table Text Block]
   
Three Months Ended
  
   
March 31, 2017
    
March 31, 2016
  
   
(in thousands)
  
Realized gain (loss)
                
Sale proceeds
   $
2,367
     $
279
  
Cost of securities sold
    
585
      
368
  
Realized gain (loss)
   $
1,782
     $
(89
 )
                 
Realized gain (loss), net of taxes
   $
1,089
     $
(55
 )