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Recent Real Estate Transactions (Disposals of Properties) (Details)							9 Months Ended
	Aug. 28, 2015 USD ($)	Aug. 26, 2015 USD ($)	Aug. 13, 2015 USD ($)	Aug. 08, 2015 USD ($) Property	Apr. 24, 2015 USD ($)	Apr. 10, 2015 USD ($)	Sep. 30, 2015 USD ($) Property	Dec. 31, 2014 USD ($)
Real Estate Properties [Line Items]
Mortgage notes payable							$ 128,208,218	$ 106,966,774
West Fargo Industrial [Member]
Real Estate Properties [Line Items]
Mortgage notes payable							4,500,000
Highland Court [Member]
Real Estate Properties [Line Items]
Mortgage notes payable							6,989,587
Sparkys Self-Storage Portfolio, Disposal Group [Member]
Real Estate Properties [Line Items]
Business acquisition contributed revenue							567,000
Business acquisition operating expenses							138,000
Proceeds from sale of property						$ 34,000,000
Mortgage notes payable retired						16,900,000
Gain (loss) on sale of property						$ 4,700,000
Yucca Valley Retail Center [Member]
Real Estate Properties [Line Items]
Mortgage notes payable							$ 6,000,000	$ 2,982,411
Proceeds from sale of property					$ 1,500,000
Gain (loss) on sale of property					$ 1,100,000
Residential Properties [Member]
Real Estate Properties [Line Items]
Number of properties | Property							62
Residential Properties [Member] | West Fargo Industrial [Member]
Real Estate Properties [Line Items]
Number of properties | Property				7
Purchase price of property acquired				$ 7,900,000
Cash payment for the properties acquired				3,400,000
Mortgage notes payable				4,500,000
Residential Properties [Member] | 300 N.P. [Member]
Real Estate Properties [Line Items]
Cash payment for the properties acquired				$ 3,800,000
Residential Properties [Member] | Research Parkway [Member]
Real Estate Properties [Line Items]
Cash payment for the properties acquired			$ 2,800,000
Residential Properties [Member] | Highland Court [Member]
Real Estate Properties [Line Items]
Purchase price of property acquired		$ 13,000,000
Cash payment for the properties acquired		6,000,000
Mortgage notes payable		$ 7,000,000
Residential Properties [Member] | One Parke Center [Member]
Real Estate Properties [Line Items]
Purchase price of property acquired	$ 9,100,000
Cash payment for the properties acquired	2,600,000
Mortgage notes payable	$ 6,600,000
Residential Properties [Member] | Seventeen Dubos Model Homes [Member]
Real Estate Properties [Line Items]
Number of properties | Property							17
Purchase price of property acquired							$ 5,700,000
Cash payment for the properties acquired							2,300,000
Mortgage notes payable							$ 3,400,000
Residential Properties [Member] | Four Dubos Model Homes [Member]
Real Estate Properties [Line Items]
Number of properties | Property							5
Proceeds from sale of property							$ 1,500,000
Mortgage notes payable retired							702,000
Gain (loss) on sale of property							$ 156,000

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