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N-2 - $ / shares | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 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 |  | 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 |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |
Risk Factors [Table Text Block] |  | Item 1A. Ri sk Factors There have been no material changes during the quarter ended September 30, 2024 to the risk factors that were included in our Annual Report on Form 10-K for the year ended December 31, 2023. |  |  |  |  |
Share Price | [1] | $ 18.55 |  | $ 18.19 | $ 19.25 |  | $ 23
NAV Per Share | [1] | 20.36 | [2] | 22.76 | 22.65 | [2] | 24.23
Share Price | [1] | 18.55 |  | 18.19 | 19.25 |  | 23
NAV Per Share | [1] | $ 20.36 | [2] | $ 22.76 | $ 22.65 | [2] | $ 24.23
[1] | Totals may not sum due to rounding.
[2] | Refer to Note 9 “Stockholders' Equity” for additional information on changes in components of Stockholders' Equity.

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