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Federal Income Tax Reporting - General and Income Tax Expense (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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) | 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 | $ 13,041,000
Income Tax Expense |  |  |
Revised Texas franchise tax | 352,000 | 398,000 | 474,000
Other Taxes | 66,000 | 35,000 | 24,000
Taxes on income | 418,000 | 433,000 | $ 498,000
Deferred income taxes | 0 |  |
Real estate assets net tax basis more (less) than book basis | $ 197,669,000 | $ 161,606,000 |

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. + References No definition available. + Details
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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. + Details
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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. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition Represents the period of statute of limitations for the entity's income tax returns, that remain subject to examination. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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