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Note 10 - Reportable Operating Segments (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three
Months
    
Nine Months
  
   
Ended
September 30,
    
Ended
September 30,
  
   
2017
    
2016
    
2017
    
2016
  
   
(in thousands)
    
(in thousands)
  
Operating Segment Revenues
                                
Real estate
   $
290
     $
3,210
     $
14,281
     $
18,876
  
Leasing
    
1,353
      
1,680
      
4,309
      
4,572
  
Utilities
    
898
      
813
      
2,403
      
2,539
  
Resort amenities and other
    
299
      
359
      
866
      
1,030
  
Total Operating Segment Revenues
   $
2,840
     $
6,062
     $
21,859
     $
27,017
  
Operating Segment Income (Loss)
                                
Real estate
   $
(38
 )   $
2,768
     $
13,065
     $
16,778
  
Leasing
    
692
      
560
      
2,592
      
2,195
  
Utilities
    
410
      
124
      
936
      
630
  
Resort amenities and other
    
57
      
192
      
78
      
357
  
Total Operating Segment Income
   $
1,121
     $
3,644
     $
16,671
     $
19,960