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Note 10 - Reportable Operating Segments (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months
  
   
Ended March 31,
  
   
2018
    
2017
  
   
(in thousands)
  
Operating Segment Revenues
                
Real estate
   $
36
     $
7,139
  
Leasing
    
1,495
      
1,586
  
Utilities
    
704
      
676
  
Resort amenities and other
    
307
      
282
  
Total Operating Segment Revenues
   $
2,542
     $
9,683
  
Operating Segment Income (Loss)
                
Real estate
   $
(30
 )   $
6,403
  
Leasing
    
917
      
1,117
  
Utilities
    
183
      
123
  
Resort amenities and other
    
(46
 )    
(51
 )
Total Operating Segment Income
   $
1,024
     $
7,592