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Note 5 - Non-operating Income (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Other Nonoperating Income, by Component [Table Text Block]
   
Three Months Ended
March 31
  
(in thousands)
  
2019
    
2018
  
Equity in earnings of unconsolidated investments
   $
2,321
     $
(6,586
 )
Dividends and net realized gains and losses on sales of securities
    
1,931
      
1,803
  
Interest income
    
1,749
      
1,718
  
Total non-operating income
   $
6,001
     $
(3,065
 )