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Percentage of Investment in Subsidiaries And Investees (Details) | Dec. 31, 2012
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Investments minimum percentage in unconsolidated subsidiaries, jointly owned companies | 20.00%
Investments maximum percentage in unconsolidated subsidiaries, jointly owned companies | 50.00%
Interest in Eton Square, under equity method | 10.00%

X
- Definition The percentage of Income Opportunity Realty Investors, Inc. interest in the Other Investee (TCI Eton Square, L.P.), which is accounted for under the equity method. + References No definition available. + Details
Name: | fil_InterestInEtonSquareUnderEquityMethod
Namespace Prefix: | fil_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The maximum percentage of investment in unconsolidated subsidiaries, jointly owned companies and other investees. + References No definition available. + Details
Name: | fil_InvestmentsMaximumPercentageInUnconsolidatedSubsidiariesJointlyOwnedCompanies
Namespace Prefix: | fil_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The minimum percentage of investment in unconsolidated subsidiaries, jointly owned companies and other investees. + References No definition available. + Details
Name: | fil_InvestmentsMinimumPercentageInUnconsolidatedSubsidiariesJointlyOwnedCompanies
Namespace Prefix: | fil_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant