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Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 14, 2019
Net income fee to related party
Entity Registrant Name	INCOME OPPORTUNITY REALTY INVESTORS INC /TX/
Entity Central Index Key	0000949961
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Trading Symbol	IOR
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity's Reporting Status Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		4,168,214
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2019

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