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Note 4 - Non-operating Income (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Other Nonoperating Income, by Component [Table Text Block]
   
Year Ended December 31,
  
   
2016
    
2015
    
2014
  
 
 
(in thousands)
 
Equity in earnings of unconsolidated investments
   $
6,636
     $
5,845
     $
6,675
  
Dividends and net realized gains on sales of securities
    
7,324
      
6,809
      
5,957
  
Interest income
    
5,705
      
5,494
      
4,550
  
    $
19,665
     $
18,148
     $
17,182