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Percentage of Investment in Subsidiaries And Investees (Details)	Dec. 31, 2012
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

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Namespace Prefix:	fil_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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