<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2026"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:ofs="http://ofs.com/20260610"
  xmlns:us-gaap="http://fasb.org/us-gaap/2026"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="ofs-20260610.xsd" xlink:type="simple"/>
    <context id="C_c95cb7b5-d596-4bee-a684-fb83433f1a09">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001487918</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:CommonStockMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-10</startDate>
            <endDate>2026-06-10</endDate>
        </period>
    </context>
    <context id="C_f44ddc7d-3c93-49f7-bc5d-38d83be99549">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001487918</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">ofs:A495PercentNotesDue2028Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-10</startDate>
            <endDate>2026-06-10</endDate>
        </period>
    </context>
    <context id="C_33922d88-6cf6-49ca-aa4f-61a6115f35b0">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001487918</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">ofs:A7.50PercentNotesDue2028Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-10</startDate>
            <endDate>2026-06-10</endDate>
        </period>
    </context>
    <context id="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001487918</identifier>
        </entity>
        <period>
            <startDate>2026-06-10</startDate>
            <endDate>2026-06-10</endDate>
        </period>
    </context>
    <dei:AmendmentFlag
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_ae5d3d39-5a1c-4491-a5f7-a879dfc5d046">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_0d7511aa-b347-46f8-8cc8-e8311f195499">0001487918</dei:EntityCentralIndexKey>
    <dei:DocumentType
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_67f277c8-ae9f-46ab-bf30-523ae10969ae">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_ad4a2d06-db28-4eb0-9dfa-ccb4c3ae9dcb">2026-06-10</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_e2fc030b-425e-49b9-accd-86f800e36ce2">OFS Capital Corporation</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_7d7fe34f-5a06-4eb8-be96-62ef00606c4e">DE</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_74981038-7950-4d4f-abfa-b43c636d7d79">814-00813</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_fabe2ac7-19ae-4a4a-a97f-0b03024c4639">46-1339639</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_9758873b-5768-41c7-87fc-ccab3c4051bf">222 W. Adams Street</dei:EntityAddressAddressLine1>
    <dei:EntityAddressAddressLine2
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_0f6da0d5-86f3-4362-9d9d-fdc875ccdb88">Suite 1850</dei:EntityAddressAddressLine2>
    <dei:EntityAddressCityOrTown
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_307d679e-1f18-49ea-8dff-5de1eb179397">Chicago</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_2271e2d1-32ab-4221-8e04-d7d7ae164e20">IL</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_ac28810b-ed01-42fb-b9e3-0e6ff359e9c7">60606</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_e54a5274-296e-4ee2-be6d-700bf3abaf8b">847</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_684a21d4-063e-4cfe-99b5-e0a9161373e7">734-2000</dei:LocalPhoneNumber>
    <dei:EntityInformationFormerLegalOrRegisteredName
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_27d0cc80-a3d5-4d96-9f2b-450d3fe8be2c">Not applicable</dei:EntityInformationFormerLegalOrRegisteredName>
    <dei:WrittenCommunications
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_025b4527-5ab8-41f9-8024-918ad4cd0bb6">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_7eee37c2-e679-4ed5-9c04-cd678c6e6d8d">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_8a5a17c3-b33d-4fc6-9f13-29f3b8148a68">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_6247f8b5-1c0d-4a76-a31f-edc562f168d5">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="C_c95cb7b5-d596-4bee-a684-fb83433f1a09"
      id="F_f1164242-9a4c-40f8-9fd2-197874a5f0ec">Common Stock, $0.01 par value per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="C_c95cb7b5-d596-4bee-a684-fb83433f1a09"
      id="F_852c7e25-39f4-4458-97a8-eab94eca6db9">OFS</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="C_c95cb7b5-d596-4bee-a684-fb83433f1a09"
      id="F_cc823c0f-a704-4a14-9503-891404210ffb">NASDAQ</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="C_f44ddc7d-3c93-49f7-bc5d-38d83be99549"
      id="F_df9d84b6-16fb-4f1e-902c-be864dc5a7b5">4.95% Notes due 2028</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="C_f44ddc7d-3c93-49f7-bc5d-38d83be99549"
      id="F_50c47132-ee1f-4ba5-a9ba-fbd05db26fb1">OFSSH</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="C_f44ddc7d-3c93-49f7-bc5d-38d83be99549"
      id="F_15fe5f85-dc1d-4694-98e3-9ef3bfb208f7">NASDAQ</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="C_33922d88-6cf6-49ca-aa4f-61a6115f35b0"
      id="F_d5f2f2a4-533c-469b-a2e3-1593b61d2665">7.50% Notes due 2028</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="C_33922d88-6cf6-49ca-aa4f-61a6115f35b0"
      id="F_8fd907b4-51b5-48ee-871e-f3a93e8137ec">OFSSO</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="C_33922d88-6cf6-49ca-aa4f-61a6115f35b0"
      id="F_67d0cfa6-00ad-4ad7-8614-e2f29888b17c">NASDAQ</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany
      contextRef="C_4f539e61-3ef1-4efa-9fed-15ea94265ccc"
      id="F_f3d77631-062f-40bb-b5ee-edccd43313eb">false</dei:EntityEmergingGrowthCompany>
</xbrl>
