Mortgages Payable Mortgage Payable by Property (Details) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Dec. 31, 2014		Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]
Long-term Debt			$ 76,707,834		$ 57,087,320
Maples on 97th [Member]
Mortgage Loans on Real Estate [Line Items]
Long-term Debt	7,500,000
Long Term Debt, Maturity date at a point in time	Feb. 10, 2016
Woodland Park [Member]
Mortgage Loans on Real Estate [Line Items]
Long Term Debt, Maturity date at a point in time		Aug. 01, 2017
Real Estate [Member]
Mortgage Loans on Real Estate [Line Items]
Long-term Debt			76,707,834		57,087,320
Real Estate [Member] | Arboretum [Member]
Mortgage Loans on Real Estate [Line Items]
Long-term Debt			17,182,764		17,500,000
Date of Debt Borrowing			2011		2011
Long Term Debt, Maturity date at a point in time			Mar. 01, 2017		Mar. 01, 2014
Debt Instrument, Interest Rate, Effective Percentage			3.75%	[1]	5.32%	[1]
Real Estate [Member] | Eagle Village [Member]
Mortgage Loans on Real Estate [Line Items]
Long-term Debt			8,224,671		8,828,435
Date of Debt Borrowing			2010		2010
Long Term Debt, Maturity date at a point in time			Sep. 01, 2015		Jun. 01, 2014
Debt Instrument, Interest Rate, Effective Percentage			4.35%	[1]	4.04%	[1]
Real Estate [Member] | Glynn Place [Member]
Mortgage Loans on Real Estate [Line Items]
Long-term Debt					1,845,058
Date of Debt Borrowing					2008
Long Term Debt, Maturity date at a point in time					May 01, 2014
Debt Instrument, Interest Rate, Effective Percentage					2.81%	[1]
Real Estate [Member] | Residences at DeCordova [Member]
Mortgage Loans on Real Estate [Line Items]
Long-term Debt			1,881,998		1,948,064
Date of Debt Borrowing			2008		2012
Long Term Debt, Maturity date at a point in time			Jun. 01, 2017		Feb. 01, 2017
Debt Instrument, Interest Rate, Effective Percentage			4.75%	[1]	5.00%	[1]
Real Estate [Member] | Residences at Weatherford [Member]
Mortgage Loans on Real Estate [Line Items]
Long-term Debt			6,043,673		6,268,311
Date of Debt Borrowing			2012		2011
Long Term Debt, Maturity date at a point in time			Jun. 01, 2017		Jul. 01, 2015
Debt Instrument, Interest Rate, Effective Percentage			4.75%	[1]	5.90%	[1]
Real Estate [Member] | The 50/50 Student Housing--UNL [Member]
Mortgage Loans on Real Estate [Line Items]
Long-term Debt					7,177,438
Date of Debt Borrowing					2013
Long Term Debt, Maturity date at a point in time					Mar. 01, 2020
Debt Instrument, Interest Rate, Effective Percentage					3.25%	[1]
Real Estate [Member] | Maples on 97th [Member]
Mortgage Loans on Real Estate [Line Items]
Long-term Debt			7,500,000		7,500,000
Date of Debt Borrowing			2013		2013
Long Term Debt, Maturity date at a point in time			Feb. 01, 2016		Mar. 01, 2016
Debt Instrument, Interest Rate, Effective Percentage			3.55%	[1]	3.47%	[1]
Real Estate [Member] | Woodland Park [Member]
Mortgage Loans on Real Estate [Line Items]
Long-term Debt			6,074,738		6,020,014
Date of Debt Borrowing			2013		2013
Long Term Debt, Maturity date at a point in time			Aug. 01, 2017		Mar. 01, 2014
Debt Instrument, Interest Rate, Effective Percentage			2.96%	[1]	2.97%	[1]
Mortgage Loans on Real Estate [Member] | Real Estate [Member] | The 50/50 Student Housing--UNL [Member]
Mortgage Loans on Real Estate [Line Items]
Long-term Debt			25,500,000
Date of Debt Borrowing			2013
Long Term Debt, Maturity date at a point in time			Mar. 01, 2020
Debt Instrument, Interest Rate, Effective Percentage			3.25%	[1]
Tax Increment Financing [Member] | The 50/50 Student Housing--UNL [Member]
Mortgage Loans on Real Estate [Line Items]
Long-term Debt			4,300,000
Long Term Debt, Maturity date at a point in time			Jan. 01, 2019
Tax Increment Financing [Member] | Real Estate [Member] | The 50/50 Student Housing--UNL [Member]
Mortgage Loans on Real Estate [Line Items]
Long-term Debt			$ 4,299,990
Date of Debt Borrowing			2014
Long Term Debt, Maturity date at a point in time			Dec. 01, 2019
Debt Instrument, Interest Rate, Effective Percentage			4.65%	[1]

[1] Represents the average effective interest rate, including fees, for the years ended December 31, 2014 and 2013 and excludes the effect of interest rate caps (Note 15).