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Recent Real Estate Transactions (Disposals of Properties) (Details)					9 Months Ended
	Jul. 15, 2016 USD ($)	Jun. 07, 2016 USD ($)	Apr. 24, 2015 USD ($)	Apr. 10, 2015 USD ($)	Sep. 30, 2016 USD ($) Property	Sep. 30, 2015 USD ($) Property	Dec. 31, 2015 USD ($)
Real Estate Properties [Line Items]
Promissory note issued for property acquired					$ 152,721,661		$ 142,638,401
Yucca Valley Retail Center [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property			$ 1,500,000
Gain (loss) on sale of property			$ 1,000,000
Sparkys Self-Storage Portfolio, Disposal Group [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property				$ 34,000,000
Mortgage notes payable retired				16,900,000
Gain (loss) on sale of property				$ 4,700,000
Percentage of real estate properties sold				100.00%
Residential Properties [Member]
Real Estate Properties [Line Items]
Number of properties | Property					93
Residential Properties [Member] | Forty Six Dubos Model Homes [Member]
Real Estate Properties [Line Items]
Number of properties | Property					46
Purchase price of property acquired					$ 15,774,855
Cash payment for the properties acquired					4,800,000
Promissory note issued for property acquired					$ 11,000,000
Residential Properties [Member] | Seventeen Dubos Model Homes [Member]
Real Estate Properties [Line Items]
Number of properties | Property					17
Proceeds from sale of property					$ 5,100,000
Mortgage notes payable retired					1,800,000
Gain (loss) on sale of property					$ 622,000
Residential Properties [Member] | Havana Parker [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property	$ 3,300,000
Gain (loss) on sale of property	$ 668,000
Residential Properties [Member] | Yucca Valley Retail Center [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property		$ 1,300,000
Gain (loss) on sale of property		$ 831,000
Residential Properties [Member] | Five Dubos Model Homes [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property						$ 1,500,000
Mortgage notes payable retired						702,000
Gain (loss) on sale of property						$ 156,000
Number of properties | Property						5

X

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Number Of Real Estate Properties Disposed.

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Percentage of real estate properties sold.

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- Definition

Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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The carrying amount of mortgage loans on real estate that were sold during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The number of real estate properties owned as of the balance sheet date.

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Aggregate cash payments for a combination of transactions that are classified as investing activities in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers. This element can be used by entities to aggregate payments for all asset purchases that are classified as investing activities.

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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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