XML 46 R1.htm IDEA: XBRL DOCUMENT v3.20.1
Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Mar. 23, 2020
Jun. 30, 2019
Cover [Abstract]      
Entity Registrant Name INCOME OPPORTUNITY REALTY INVESTORS INC /TX/    
Entity Central Index Key 0000949961    
Document Type 10-K    
Document Period End Date Dec. 31, 2019    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well Known Seasoned Issuer No    
Entity Voluntary Filers No    
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   4,173,675  
Entity Public Float     $ 7,531,229
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019