Mortgage Payable and Other Secured Financing - Summary of Mortgage Payable and Other Secured Financing, Net of Deferred Financing Costs (Details) - USD ($)		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Mortgage Loans on Real Estate [Line Items]
Outstanding Mortgage Payable, net		$ 35,453,563	$ 35,540,174
Period End Rate		4.38%	4.21%
Real Estate [Member] | Jade Park [Member]
Mortgage Loans on Real Estate [Line Items]
Outstanding Mortgage Payable, net		$ 7,470,423	$ 7,468,548
Year Acquired		2016	2016
Stated Maturity		Oct. 01, 2021	Oct. 01, 2021
Variable / Fixed		Fixed	Fixed
Reset Frequency		N/A	N/A
Period End Rate		3.85%	3.85%
Tax Increment Financing [Member] | Real Estate [Member] | The 50/50 Student Housing--UNL [Member]
Mortgage Loans on Real Estate [Line Items]
Outstanding Mortgage Payable, net		$ 3,374,881	$ 3,358,370
Year Acquired		2014	2014
Stated Maturity		Dec. 01, 2019	Dec. 01, 2019
Variable / Fixed		Fixed	Fixed
Reset Frequency		N/A	N/A
Period End Rate		4.65%	4.65%
Mortgages payable [Member] | Real Estate [Member] | The 50/50 Student Housing--UNL [Member]
Mortgage Loans on Real Estate [Line Items]
Outstanding Mortgage Payable, net		$ 24,608,259	$ 24,713,256
Year Acquired		2013	2013
Stated Maturity		Mar. 01, 2020	Mar. 01, 2020
Variable / Fixed		Variable	Variable
Reset Frequency		Monthly	Monthly
Variable Based Rate	[1]	4.50%	4.25%
Period End Rate		4.50%	4.25%

[1] Variable rate is based on Wall Street Journal Prime Rate