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Document and Entity Information
Aug. 07, 2025
Cover [Abstract]  
Entity Registrant Name Portman Ridge Finance Corp
Security Exchange Name NASDAQ
Amendment Flag false
Entity Central Index Key 0001372807
Document Type 8-K
Document Period End Date Aug. 07, 2025
Entity Incorporation State Country Code DE
Entity File Number 814-00735
Entity Tax Identification Number 20-5951150
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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.01 per share
Trading Symbol PTMN
Entity Emerging Growth Company false