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DESCRIPTION OF BUSINESS AND PRINCIPLES OF INTERIM STATEMENTS - Restricted Cash and Investment Securities (Details)
1 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
Dec. 31, 2009
USD ($)
Mar. 31, 2018
USD ($)
Transaction
item
property
Feb. 28, 2018
USD ($)
Feb. 21, 2018
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Restricted Cash              
Restricted Cash     $ 3,148,997   $ 1,200,000 $ 6,508,131 $ 5,882,767
Investment Securities              
Loss from disposition of Investment Securities   $ 0          
First mortgage loan              
Restricted Cash              
Mortgage loan originated $ 3,000,000            
Escrow deposit to be reinvested through like-kind exchange structure              
Restricted Cash              
Restricted Cash     184,000        
Restricted cash, escrow deposit related to land transactions              
Restricted Cash              
Restricted Cash     $ 1,500,000        
Number of separate escrow accounts | item     4        
Number of separate land transactions | Transaction     4        
Restricted cash reserve for interest and property taxes for first mortgage loan investment              
Restricted Cash              
Restricted Cash     $ 127,000        
Capital replacement reserve account              
Restricted Cash              
Restricted Cash     $ 172,000        
Number of real estate properties in financing | property     6        
Leasing reserve account              
Restricted Cash              
Restricted Cash       $ 1,200,000