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Jul. 23, 2024
Cover [Abstract]  
Entity Central Index Key 0001372807
Amendment Flag false
Securities Act File Number 814-00735
Document Type 8-K
Entity Registrant Name Portman Ridge Finance Corporation
Entity Address, Address Line One 650 Madison Avenue
Entity Address, Address Line Two 3rd Floor
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10022
City Area Code 212
Local Phone Number 891-2880
Entity Emerging Growth Company false