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Noncontrolling Interests
12 Months Ended
Dec. 31, 2020
Noncontrolling Interest [Abstract]  
Noncontrolling Interests Noncontrolling InterestsThe noncontrolling interest represents the third party ownership interest in Income Opportunity Realty Investors, Inc. ("IOR"). Shares of of IOR are listed on the New York stock exchange under the symbol of IOR. We owned 18.9% in in IOR during the years ended December 31, 2020, 2019 and 2018.