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N-2
 9 Months Ended
Sep. 30, 2022
Cover [Abstract]  
Entity Central Index Key 0001372807
Amendment Flag false
Securities Act File Number 814-00735
Document Type 10-Q
Entity Registrant Name Portman Ridge Finance Corporation
Entity Address, Address Line One 650 Madison Avenue
Entity Address, Address Line Two 23rd 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
General Description of Registrant [Abstract]  
Risk Factors [Table Text Block]

Item 1A. Risk Factors

Other than the items noted below, there have been no material changes during fiscal 2021 to the risk factors that were included in our Annual Report on Form 10-K for the year ended December 31, 2021.