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N-2 - $ / shares | 9 Months Ended |  |  |
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Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
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 quarter ended September 30, 2023 to the risk factors that were included in our Annual Report on Form 10-K for the year ended December 31, 2022. We, our Adviser, and our portfolio companies may maintain cash balances at financial institutions that exceed federally insured limits and may otherwise be materially affected by adverse developments affecting the financial services industry, such as actual events or concerns involving liquidity, defaults or non-performance by financial institutions or transactional counterparties. Our cash and our Adviser’s cash is held in accounts at U.S. banking institutions that we believe are of high quality. Cash held by us, our Adviser and by our portfolio companies in non-interest-bearing and interest-bearing operating accounts may exceed the Federal Deposit Insurance Corporation (“FDIC”) insurance limits. If such banking institutions were to fail, we, our Adviser, or our portfolio companies could lose all or a portion of those amounts held in excess of such insurance limitations. In addition, actual events involving limited liquidity, defaults, non-performance or other adverse developments that affect financial institutions, transactional counterparties or other companies in the financial services industry or the financial services industry generally, or concerns or rumors about any events of these kinds or other similar risks, have in the past and may in the future lead to market-wide liquidity problems, which could adversely affect our, our Adviser’s and our portfolio companies’ business, financial condition, results of operations or prospects. Although we and our Adviser assess our and our portfolio companies’ banking relationships as we believe necessary or appropriate, our and our portfolio companies’ access to funding sources and other credit arrangements in amounts adequate to finance or capitalize our respective current and projected future business operations could be significantly impaired by factors that affect us, our Adviser or our portfolio companies, the financial institutions with which we, our Adviser or our portfolio companies have arrangements directly, or the financial services industry or economy in general. These factors could include, among others, events such as liquidity constraints or failures, the ability to perform obligations under various types of financial, credit or liquidity agreements or arrangements, disruptions or instability in the financial services industry or financial markets, or concerns or negative expectations about the prospects for companies in the financial services industry. These factors could involve financial institutions or financial services industry companies with which we, our Adviser or our portfolio companies have financial or business relationships, but could also include factors involving financial markets or the financial services industry generally. In addition, investor concerns regarding the U.S. or international financial systems could result in less favorable commercial financing terms, including higher interest rates or costs and tighter financial and operating covenants, or systemic limitations on access to credit and liquidity sources, thereby making it more difficult for us, our Adviser, or our portfolio companies to acquire financing on acceptable terms or at all. |  |  |  |  |
Share Price | [1] | $ 19.25 |  | $ 23.00 | $ 21 |  | $ 24.76
NAV Per Share | [1] | 22.65 | [2] | 24.23 | 26.18 | [2] | 28.88
Share Price | [1] | 19.25 |  | 23.00 | 21 |  | 24.76
NAV Per Share | [1] | $ 22.65 | [2] | $ 24.23 | $ 26.18 | [2] | $ 28.88
[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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