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Note C - Marketable Equity Securities (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Marketable Securities [Table Text Block]
   
September
30, 2017
    
December 31, 2016
  
   
(in thousands)
  
Fair market value
   $
24,994
     $
27,621
  
Cost
    
16,175
      
15,569
  
Unrealized gain
   $
8,819
     $
12,052
  
Unrealized Gain (Loss) on Investments [Table Text Block]
   
September
30, 2017
    
December 31, 201
6
  
   
(in thousands)
  
Gross unrealized gains
   $
9,062
     $
12,161
  
Gross unrealized losses
    
243
      
109
  
Net unrealized gains
   $
8,819
     $
12,052
  
Schedule of Realized Gain (Loss) [Table Text Block]
   
Three Months Ended
    
Nine
Months Ended
  
   
September
30,
    
September
30,
  
   
2017
    
2016
    
2017
    
2016
  
   
(in thousands, except per share data)
  
Sales proceeds
   $
2,928
     $
1,271
     $
6,007
     $
1,550
  
Cost of securities sold
    
405
      
178
      
1,338
      
547
  
Realized gain
   $
2,523
     $
1,093
     $
4,669
     $
1,003
  
                                 
Realized gain, net of taxes
   $
1,546
     $
676
     $
2,862
     $
621