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Investments - Company Portfolio by Security and Investment (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Sep. 30, 2023
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Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 652,217 |  | $ 584,586 |
Cost/Amortized Cost |  | 652,217 |  | 584,586 |
Fair Value |  | 576,478 |  | 500,419 |
Fair Value |  | $ 576,478 |  | $ 500,419 |
Investment Owned Percent | [1],[2] | 100.00% |  | 100.00% |
Aerospace and Defense |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 10,579 |  | $ 9,456 |
Fair Value |  | $ 10,494 |  | $ 9,587 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Asset Management Company |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 17,791 | [3] | $ 17,791 | [4]
Automotive |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | 7,329 |  | 6,574 |
Fair Value |  | $ 6,947 |  | $ 5,408 |
Investment Owned Percent | [1] | 1.00% |  | 1.00% |
Banking, Finance, Insurance & Real Estate |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 76,038 |  | $ 53,155 |
Fair Value |  | $ 78,264 |  | $ 54,235 |
Investment Owned Percent | [1] | 14.00% |  | 11.00% |
Beverage, Food and Tobacco |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 12,619 |  | $ 11,952 |
Fair Value |  | $ 12,456 |  | $ 11,759 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Capital Equipment |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 10,681 |  | $ 10,683 |
Fair Value |  | $ 2,745 |  | $ 1,435 |
Investment Owned Percent | [1] | 1.00% |  | 0.00% |
Chemicals, Plastics and Rubber |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 10,447 |  | $ 9,713 |
Fair Value |  | $ 10,359 |  | $ 9,701 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
CLO Fund Securities |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 34,649 |  | $ 21,868 |
Fair Value |  | $ 20,453 |  | $ 10,425 |
Investment Owned Percent | [1] | 3.00% |  | 2.00% |
Construction & Building |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 9,545 |  | $ 7,755 |
Fair Value |  | $ 9,199 |  | $ 7,501 |
Investment Owned Percent | [1] | 2.00% |  | 1.00% |
Consumer goods: Durable |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 16,762 |  | $ 16,635 |
Fair Value |  | $ 13,943 |  | $ 13,413 |
Investment Owned Percent | [1] | 2.00% |  | 3.00% |
Containers, Packaging and Glass |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 2,754 |  | $ 2,736 |
Fair Value |  | $ 2,655 |  | $ 2,736 |
Investment Owned Percent | [1] | 1.00% |  | 1.00% |
Electronics |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 10,866 |  | $ 7,454 |
Fair Value |  | $ 11,129 |  | $ 7,616 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Energy: Electricity |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 671 |  | $ 671 |
Fair Value |  | $ 671 |  | $ 672 |
Investment Owned Percent | [1] | 0.00% |  | 0.00% |
Energy: Oil & Gas |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 6,718 |  | $ 6,719 |
Fair Value |  | $ 1,056 |  | $ 495 |
Investment Owned Percent | [1] | 0.00% |  | 0.00% |
Environmental Industries |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 4,315 |  |  |
Fair Value |  | $ 4,930 |  |  |
Investment Owned Percent | [1] | 1.00% |  |  |
Finance |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 17,570 |  | $ 18,950 |
Fair Value |  | $ 17,581 |  | $ 19,090 |
Investment Owned Percent | [1] | 3.00% |  | 4.00% |
Forest Products & Paper |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 1,589 |  |  |
Fair Value |  | $ 1,373 |  |  |
Investment Owned Percent | [1] | 0.00% |  |  |
Healthcare, Education and Childcare |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 9,726 |  | $ 6,190 |
Fair Value |  | $ 9,586 |  | $ 6,187 |
Investment Owned Percent | [1] | 2.00% |  | 1.00% |
Healthcare & Pharmaceuticals |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 51,901 |  | $ 59,881 |
Fair Value |  | $ 50,566 |  | $ 57,802 |
Investment Owned Percent | [1] | 9.00% |  | 12.00% |
High Tech Industries |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 83,661 |  | $ 85,656 |
Fair Value |  | $ 73,994 |  | $ 77,590 |
Investment Owned Percent | [1] | 13.00% |  | 16.00% |
Hotel, Gaming & Leisure |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 10,245 |  | $ 10,764 |
Fair Value |  | $ 6,798 |  | $ 3,538 |
Investment Owned Percent | [1] | 1.00% |  | 1.00% |
Joint Venture |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 68,850 |  | $ 75,513 |
Fair Value |  | $ 58,955 |  | $ 62,231 |
Investment Owned Percent |  | 10.00% | [1] | 12.00% |
Machinery (Non-Agrclt/Constr/Electr) |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 9,461 |  | $ 10,411 |
Fair Value |  | $ 9,291 |  | $ 10,504 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Media: Advertising, Printing & Publishing |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 150 |  |  |
Fair Value |  | $ 549 |  |  |
Investment Owned Percent | [1] | 0.00% |  |  |
Media: Broadcasting & Subscription |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 14,930 |  | $ 16,241 |
Fair Value |  | $ 14,358 |  | $ 14,445 |
Investment Owned Percent | [1] | 2.00% |  | 3.00% |
Media: Diversified & Production |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 6,976 |  | $ 1,493 |
Fair Value |  | $ 6,572 |  | $ 1,500 |
Investment Owned Percent | [1] | 1.00% |  | 0.00% |
Metals & Mining |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 15,846 |  | $ 9,000 |
Fair Value |  | $ 14,786 |  | $ 7,963 |
Investment Owned Percent | [1] | 3.00% |  | 2.00% |
Retail |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 10,772 |  | $ 9,113 |
Fair Value |  | $ 10,871 |  | $ 9,031 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Services: Business |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 66,807 |  | $ 68,006 |
Fair Value |  | $ 66,207 |  | $ 66,655 |
Investment Owned Percent | [1] | 11.00% |  | 13.00% |
Services: Consumer |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 8,569 |  |  |
Fair Value |  | $ 8,128 |  |  |
Investment Owned Percent | [1] | 1.00% |  |  |
Telecommunications |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 11,475 |  | $ 11,126 |
Fair Value |  | $ 10,077 |  | $ 10,139 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Textiles and Leather |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 12,689 |  |  |
Fair Value |  | $ 12,808 |  |  |
Investment Owned Percent | [1] | 2.00% |  |  |
Transportation: Cargo |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 11,583 |  | $ 11,601 |
Fair Value |  | $ 11,342 |  | $ 11,355 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Transportation: Consumer |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 7,653 |  | $ 7,479 |
Fair Value |  | $ 7,335 |  | $ 7,406 |
Investment Owned Percent | [1] | 1.00% |  | 1.00% |
Senior Secured Loan |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 435,856 |  | $ 378,284 |
Fair Value |  | $ 418,722 |  | $ 360,994 |
Investment Owned Percent | [2] | 73.00% |  | 72.00% |
Junior Secured Loan |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 65,776 |  | $ 61,016 |
Fair Value |  | $ 56,400 |  | $ 47,537 |
Investment Owned Percent | [2] | 10.00% |  | 10.00% |
Senior Unsecured Bond |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 416 |  | $ 416 |
Fair Value |  | $ 43 |  | $ 43 |
Investment Owned Percent | [2] | 0.00% |  | 0.00% |
Equity Securities |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 28,848 |  | $ 29,667 |
Fair Value |  | $ 21,905 |  | $ 19,189 |
Investment Owned Percent | [2] | 4.00% |  | 4.00% |
CLO Fund Securities |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 34,649 |  | $ 21,868 |
Fair Value |  | $ 20,453 |  | $ 10,425 |
Investment Owned Percent | [2] | 3.00% |  | 2.00% |
Asset Manager Affiliates |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost | [4] | $ 17,791 |  | $ 17,791 |
Joint Ventures |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | 68,850 |  | 75,513 |
Fair Value |  | $ 58,955 |  | $ 62,231 |
Investment Owned Percent | [2] | 10.00% |  | 12.00% |
Derivatives |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  |  |  | $ 31 |
Cost/Amortized Cost |  | $ 31 |  |  |
[1] | Calculated as a percentage of total portfolio at fair value.
[2] | Represents percentage of total portfolio at fair value.
[3] | Represents the equity investment in the Asset Manager Affiliates
[4] | Represents the equity investment in the Asset Manager Affiliates.

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