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Note 3 - Marketable Equity Securities (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Marketable Securities [Table Text Block]
 
 
2016
 
 
2015
 
 
 
(in thousands)
 
Available-for-sale securities
                
Fair market value
   $
27,621
     $
24,575
  
Cost
    
15,569
      
16,015
  
Unrealized gain
   $
12,052
     $
8,560
  
Unrealized Gain (Loss) on Investments [Table Text Block]
 
 
2016
 
 
2015
 
 
 
(in thousands)
 
Available-for-sale securities
                
Gross unrealized gains
   $
12,161
     $
9,893
  
Gross unrealized losses
    
109
      
1,333
  
Net unrealized gains
   $
12,052
     $
8,560
  
Realized Gain (Loss) on Investments [Table Text Block]
 
 
2015
 
 
2014
 
 
 
(in thousands)
 
Trading securities
                
Recognized gain (loss) at beginning of period
   $
146
     $
8
  
Recognized gain at end of period
    
-
      
146
  
Securities transferred from trading to available-for-sale
    
(81
 )    
-
  
                 
Change in net recognized gain (loss)
   $
(65
 )   $
138
  
Schedule of Realized Gain (Loss) [Table Text Block]
 
 
2016
 
 
2015
 
 
2014
 
 
 
(in thousands)
 
Realized gains
                        
Sale proceeds
   $
1,550
     $
1,500
     $
1,720
  
Cost of securities sold
    
547
      
434
      
818
  
                         
Realized gains
   $
1,003
     $
1,066
     $
902
  
                         
Realized gains, net of taxes
   $
627
     $
654
     $
546