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Note 3 - Marketable Equity Securities (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Marketable Securities [Table Text Block]
   
201
7
    
201
6
  
   
(in thousands)
  
Available-for-sale securities
:
                
Fair market value
   $
26,664
     $
27,621
  
Cost
    
16,640
      
15,569
  
Unrealized gain
   $
10,024
     $
12,052
  
Unrealized Gain (Loss) on Investments [Table Text Block]
   
201
7
    
201
6
  
   
(in thousands)
  
Available-for-sale securities
:
                
Gross unrealized gains
   $
10,150
     $
12,161
  
Gross unrealized losses
    
126
      
109
  
Net unrealized gains
   $
10,024
     $
12,052
  
Schedule of Realized Gain (Loss) [Table Text Block]
   
201
7
    
20
1
6
    
20
1
5
  
   
(in thousands)
  
Realized gains
:
                        
Sale proceeds
   $
6,833
     $
1,550
     $
1,500
  
Cost of securities sold
    
2,098
      
547
      
434
  
                         
Realized gains
   $
4,735
     $
1,003
     $
1,066
  
                         
Realized gains, net of taxes
   $
2,938
     $
627
     $
654