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Document and Entity Information Document
Jun. 03, 2025
Entity Information [Line Items]  
Entity Registrant Name Portman Ridge Finance Corporation
Amendment Flag false
Entity Central Index Key 0001372807
Document Type 8-K
Document Period End Date Jun. 03, 2025
Entity Incorporation, State or Country Code DE
Entity File Number 814-00735
Entity Tax Identification Number 20-5951150
Entity Address, Address Line One 650 Madison Avenue, 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 true
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.01 per share
Trading Symbol PTMN
Security Exchange Name NASDAQ
Entity Emerging Growth Company false