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COMMITMENTS AND CONTINGENCIES - Contractual Commitments - Expenditures (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
Jan. 31, 2017
Dec. 31, 2015
USD ($)
a
Dec. 31, 2013
USD ($)
a
Jun. 30, 2017
USD ($)
ft²
a
restaurant
Mar. 31, 2017
a
Jun. 30, 2017
USD ($)
ft²
a
restaurant
Jun. 30, 2016
a
Dec. 31, 2013
USD ($)
a
Dec. 31, 2016
USD ($)
a
Commitments                    
Restricted Cash         $ 4,727,381   $ 4,727,381     $ 9,855,469
Beachfront property                    
Commitments                    
Acres | a         6   6     6
Beachfront property | Restaurant property                    
Commitments                    
Payments for construction in progress             $ 446,000      
Estimated costs expected to be incurred related to construction of buildings and tenant improvements             4,700,000      
Total estimated cost to improve the land and develop the income properties             $ 6,000,000      
Number of properties | restaurant         2   2      
Golf course renovation commitment                    
Commitments                    
Commitment amount         $ 350,000   $ 350,000      
Construction cost incurred         119,000          
Remaining amount of commitment         231,000   231,000      
Site Work Contract | Restaurant property                    
Commitments                    
Commitment amount $ 872,000                  
Development costs incurred $ 0                  
Sam's Club affiliate | Buyer reimbursement                    
Commitments                    
Deposit of cash in escrow classified as restricted cash     $ 125,000              
Restricted Cash         125,000   125,000      
Williamson Crossing site                    
Commitments                    
Acres | a       19.6         19.6  
Estimated cost for improvements                 $ 1,260,000  
Williamson Crossing site | Road and other land improvements                    
Commitments                    
Area of land subject to contractual commitment | a       23            
Williamson Crossing site | Buyer reimbursement                    
Commitments                    
Percentage of cost paid                 77.50%  
Commitment amount       $ 976,500         $ 976,500  
Reimbursement period of land improvement cost                 5 years  
Deposit of cash in escrow classified as restricted cash                 $ 283,500  
Restricted Cash         287,000   287,000      
Williamson Business Park property | Relocation of corporate offices                    
Commitments                    
Construction cost incurred         538,000          
Remaining amount of commitment         140,000   $ 140,000      
Estimated costs expected to be incurred related to construction of buildings and tenant improvements         $ 678,000          
Area of real estate property | ft²         7,700   7,700      
The Grove at Winter Park | Construction commitment                    
Commitments                    
Commitment amount         $ 3,700,000   $ 3,700,000      
Construction cost incurred             3,400,000      
Remaining amount of commitment         $ 314,000   $ 314,000      
Westcliff property                    
Commitments                    
Acres | a         10.3   10.3      
Westcliff property | Property improvements                    
Commitments                    
Commitment amount         $ 590,000   $ 590,000      
Construction cost incurred         0          
Maximum | Sam's Club affiliate | Buyer reimbursement                    
Commitments                    
Commitment amount         125,000   125,000      
Maximum | Williamson Crossing site | Buyer reimbursement                    
Commitments                    
Remaining amount of commitment         $ 690,000   $ 690,000      
Land Sales                    
Commitments                    
Acres sold | a         81.43 1,587.35 1,668.78 7.5    
Land Sales | Race Trac                    
Commitments                    
Acres sold | a       3.4            
Land Sales | Sam's Club affiliate                    
Commitments                    
Acres sold | a     18.1              
Land purchase | Golf course renovation commitment                    
Commitments                    
Agreement term   1 year