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Income Taxes - General and Income Tax Expense (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Taxes
Maximum ownership as a percentage of the voting power or value of the securities of each issuer other than REIT or "TRS"	10.00%
Maximum ownership of securities in all TRS (as a percent)	20.00%		25.00%
Maximum ownership of securities in all TRS when considered together with other non-real estate assets (as a percent)	25.00%
Period of statute of limitations applicable to the entity's income tax returns	3 years
Net operating losses
NOLs expiration period	20 years
Gross amount of NOLs available to company	$ 13,041,000		$ 13,041,000
Income Tax Expense
Revised Texas franchise tax	70,000.000	$ 89,000.000
Other Taxes	12,000.000	36,000.000
Taxes on income	82,000	$ 125,000
Deferred income taxes	$ 0

X

- Definition

The portion of the difference between total income tax expense or benefit as reported in the income statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the Revised Texas Franchise Tax.

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- Definition

Represents the maximum ownership in all Taxable REIT Subsidiaries that can be held by the entity as a percentage of its assets value to maintain its REIT status.

+ References

No definition available.

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- Definition

Represents the maximum ownership in all Taxable REIT Subsidiaries that can be held by the entity as a percentage of its assets value when considered together with other non-real estate assets to maintain its REIT status.

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No definition available.

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- Definition

Represents the maximum ownership that the entity can hold as a percentage of the voting power or value of the securities of each issuer which is not a REIT or Taxable REIT Subsidiary.

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- Definition

Represents the period after which the net operating losses expire.

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Represents the period of statute of limitations for the entity's income tax returns, that remain subject to examination.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

+ 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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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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