v3.25.1
Cover
Jun. 05, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 05, 2025
Entity File Number 811-22299
Entity Registrant Name RENN Fund, Inc.
Entity Central Index Key 0000919567
Entity Tax Identification Number 75-2533518
Entity Incorporation, State or Country Code TX
Entity Address, Address Line One 1999 Bryan Street
Entity Address, Address Line Two Suite 900
Entity Address, City or Town Dallas
Entity Address, State or Province TX
Entity Address, Postal Zip Code 75201-3136
City Area Code 646
Local Phone Number 291-2300
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Entity Emerging Growth Company false