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BUSINESS SEGMENT DATA - Description (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2018
segment
loan
item
property
Sep. 30, 2017
Dec. 31, 2017
Business segment data      
Number of business segments | segment 4    
Golf Operations      
Business segment data      
Number of golf courses owned | property 2    
Number of holes to the golf course | item 18    
Commercial loans      
Business segment data      
Number of mortgage loan investments | loan 0    
Product concentration | Identifiable assets | Income Properties      
Business segment data      
Percentage of total 87.60%   83.40%
Product concentration | Consolidated revenues | Income Properties      
Business segment data      
Percentage of total 49.60% 30.50%