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Cover
Jul. 23, 2024
Document Information [Line Items]  
Document Type 8-K
Document Period End Date Jul. 23, 2024
Entity Registrant Name Portman Ridge Finance Corporation
Entity Incorporation, State or Country Code DE
Securities Act 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
Entity Emerging Growth Company false
Entity Central Index Key 0001372807
Amendment Flag false
Title of 12(b) Security Common Stock, par value $0.01 per share
Trading Symbol PTMN
Security Exchange Name NASDAQ