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Note 4 - Marketable Equity Securities (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Marketable Securities [Table Text Block]
   
2018
    
2017
  
   
(in thousands)
  
Available-for-sale securities:
                
Fair market value
   $
27,549
     $
26,664
  
Cost
    
25,602
      
16,640
  
Unrealized gain
   $
1,947
     $
10,024
  
Unrealized Gain (Loss) on Investments [Table Text Block]
   
2018
    
2017
  
   
(in thousands)
  
Available-for-sale securities:
                
Gross unrealized gains
   $
5,668
     $
10,150
  
Gross unrealized losses
    
3,721
      
126
  
Net unrealized gains
   $
1,947
     $
10,024
  
Schedule of Realized Gain (Loss) [Table Text Block]
   
2018
    
2017
    
2016
  
   
(in thousands)
  
Realized gains:
                        
Sale proceeds
   $
1,044
     $
6,833
     $
1,550
  
Cost of securities sold
    
669
      
2,098
      
547
  
                         
Realized gains
   $
375
     $
4,735
     $
1,003
  
                         
Realized gains, net of taxes
   $
278
     $
2,938
     $
627