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Note 4 - Other Revenues (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Other Revenues [Table Text Block]
   
Three Months Ended
June 30
    
Six Months Ended
June 30
  
(in thousands)
  
2018
    
2017
    
2018
    
2017
  
Rental income
   $
5,553
     $
5,515
     $
11,086
     $
11,001
  
Management and accounting services fees
    
3,738
      
3,752
      
7,446
      
7,611
  
Insurance services
    
1,955
      
2,087
      
3,646
      
3,644
  
Other
    
242
      
256
      
579
      
638
  
Total other revenues
   $
11,488
     $
11,610
     $
22,757
     $
22,894