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Subsequent Events - Narrative (Details) - USD ($)
1 Months Ended 9 Months Ended
Oct. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Subsequent Event [Line Items]      
Sales price, gross   $ 48,500,000  
Mortgage and other notes receivable [1]   8,171,000 $ 8,945,000
Unsecured Term Loan 2      
Subsequent Event [Line Items]      
Face amount of debt instrument   $ 350,000,000  
Variable rate (as a percent)   1.75%  
Other | Parkway Plaza | Subsequent Event      
Subsequent Event [Line Items]      
Sales price, gross $ 16,500,000    
Mortgages      
Subsequent Event [Line Items]      
Mortgage and other notes receivable   $ 5,189,000 5,418,000
Mortgages | Village Square      
Subsequent Event [Line Items]      
Mortgage and other notes receivable   $ 1,554,000 $ 1,596,000
Construction Loans | Subsequent Event      
Subsequent Event [Line Items]      
Face amount of debt instrument $ 29,400,000    
Term of debt instrument 3 years    
Option extension term of debt instrument 1 year    
LIBOR | Construction Loans | Subsequent Event      
Subsequent Event [Line Items]      
Variable rate (as a percent) 2.90%    
[1] As of September 30, 2018, includes $621,616 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $414,923 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 6.