XML 29 R1.htm IDEA: XBRL DOCUMENT v3.20.1
Cover - shares
 3 Months Ended
Mar. 31, 2020
May 13, 2020
Cover [Abstract]    
Entity Registrant Name INCOME OPPORTUNITY REALTY INVESTORS INC /TX/  
Entity Central Index Key 0000949961  
Document Type 10-Q  
Document Period End Date Mar. 31, 2020  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity File Number 001-14784  
Entity Incorporation, State or Country Code NV  
Entity Reporting Status Current Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   4,168,214
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2020