Real Estate Assets - Gains on Sale, Net of Income Taxes (Details)	1 Months Ended						12 Months Ended
	Nov. 30, 2017 USD ($) Unit	Mar. 31, 2017 USD ($) Unit	Jul. 31, 2016 USD ($) Unit	Jun. 30, 2016 USD ($) Unit	Aug. 31, 2015 USD ($) Unit	May 31, 2015 USD ($) Unit	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) Unit	Dec. 31, 2015 USD ($)
Real Estate [Line Items]
Gain (Loss) on Sale of Properties							$ 17,753,303	$ 14,072,317	$ 4,599,109
Northern View [Member] | Highland Heights, KY [Member]
Real Estate [Line Items]
Number of Units (Unaudited) | Unit								294
Eagle Village [Member] | Evansville, IN [Member]
Real Estate [Line Items]
Number of Units (Unaudited) | Unit								511
Residences at DeCordova [Member] | Granbury, TX [Member]
Real Estate [Line Items]
Number of Units (Unaudited) | Unit								110
Residences at Weatherford [Member] | Weatherford, TX [Member]
Real Estate [Line Items]
Number of Units (Unaudited) | Unit								76
MF Properties [Member] | Northern View [Member] | Highland Heights, KY [Member]
Real Estate [Line Items]
Number of Units (Unaudited) | Unit		294
Gross Proceeds		$ 13,750,000
Gain (Loss) on Sale of Properties		$ 7,174,183
MF Properties [Member] | Eagle Village [Member] | Evansville, IN [Member]
Real Estate [Line Items]
Number of Units (Unaudited) | Unit	511
Gross Proceeds	$ 12,775,000
Gain (Loss) on Sale of Properties	$ 2,782,107
MF Properties [Member] | Residences at DeCordova [Member] | Granbury, TX [Member]
Real Estate [Line Items]
Number of Units (Unaudited) | Unit	110
Gross Proceeds	$ 12,100,000
Gain (Loss) on Sale of Properties	$ 5,174,645
MF Properties [Member] | Residences at Weatherford [Member] | Weatherford, TX [Member]
Real Estate [Line Items]
Number of Units (Unaudited) | Unit	76
Gross Proceeds	$ 7,900,000
Gain (Loss) on Sale of Properties	$ 2,644,040
MF Properties [Member] | Arboretum [Member] | Omaha, NE [Member]
Real Estate [Line Items]
Number of Units (Unaudited) | Unit				145
Gross Proceeds				$ 30,200,000
Gain (Loss) on Sale of Properties				$ 12,410,444
MF Properties [Member] | Woodland Park [Member] | Topeka, KS [Member]
Real Estate [Line Items]
Number of Units (Unaudited) | Unit			236
Gross Proceeds			$ 15,650,000
Gain (Loss) on Sale of Properties			$ 1,661,873
MF Properties [Member] | The Colonial [Member] | Omaha, NE [Member]
Real Estate [Line Items]
Number of Units (Unaudited) | Unit						258
Gross Proceeds						$ 10,696,510
Gain (Loss) on Sale of Properties						$ 3,427,044
MF Properties [Member] | Glynn Place [Member] | Brunswick, GA [Member]
Real Estate [Line Items]
Number of Units (Unaudited) | Unit					128
Gross Proceeds					$ 5,500,000
Gain (Loss) on Sale of Properties					$ 1,172,065