Organization and Basis Of Presentation (Details) (USD $)	Mar. 31, 2015
Organization and Basis Of Presentation
Percentage of Transcontinental Realty Investors, Inc on common stock	81.10%
Land in acres	184.7fil_LandInAcres
Note Receivables due from related parties(million)	$ 25,400,000

Percentage of stock held by Transcontinental Realty Investors, Inc. in the common stock of Income Opportunity Realty Investors Inc.

No definition available.

Name:	fil_PercentageOfTranscontinentalRealtyInvestorsIncOnCommonStock1
Namespace Prefix:	fil_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant