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Investments - Company Portfolio by Security and Investment (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 605,365 |  | $ 652,217 |
Cost/Amortized Cost |  | 31 |  |  |
Cost/Amortized Cost |  | 605,396 |  |  |
Fair Value |  | 549,985 |  | $ 576,478 |
Fair Value |  | (2,412) |  |  |
Fair Value |  | $ 547,573 |  |  |
Investment Owned Percent | [1],[2] | 100.00% |  | 100.00% |
Aerospace and Defense |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 11,730 |  | $ 10,579 |
Fair Value |  | $ 11,692 |  | $ 10,494 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Asset Management Company |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost | [3] | $ 17,791 |  | $ 17,791 |
Automotive |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | 11,331 |  | 7,329 |
Fair Value |  | $ 11,487 |  | $ 6,947 |
Investment Owned Percent | [1] | 2.00% |  | 1.00% |
Banking, Finance, Insurance & Real Estate |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 41,487 |  | $ 76,038 |
Fair Value |  | $ 42,858 |  | $ 78,264 |
Investment Owned Percent | [1] | 8.00% |  | 14.00% |
Beverage, Food and Tobacco |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 5,511 |  | $ 12,619 |
Fair Value |  | $ 5,625 |  | $ 12,456 |
Investment Owned Percent | [1] | 1.00% |  | 2.00% |
Capital Equipment |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 14,387 |  | $ 10,681 |
Fair Value |  | $ 10,620 |  | $ 2,745 |
Investment Owned Percent | [1] | 2.00% |  | 1.00% |
Chemicals, Plastics & Rubber |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 12,692 |  | $ 10,447 |
Fair Value |  | $ 12,969 |  | $ 10,359 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
CLO Fund Securities |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 51,561 |  | $ 34,649 |
Fair Value |  | $ 31,632 |  | $ 20,453 |
Investment Owned Percent | [1] | 6.00% |  | 3.00% |
Construction & Building |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 8,966 |  | $ 9,545 |
Fair Value |  | $ 9,501 |  | $ 9,199 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Consumer goods: Durable |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 25,151 |  | $ 16,762 |
Fair Value |  | $ 24,831 |  | $ 13,943 |
Investment Owned Percent | [1] | 5.00% |  | 2.00% |
Consumer goods: Non-durable |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 4,162 |  |  |
Fair Value |  | $ 4,197 |  |  |
Investment Owned Percent | [1] | 1.00% |  |  |
Containers, Packaging and Glass |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 2,780 |  | $ 2,754 |
Fair Value |  | $ 2,570 |  | $ 2,655 |
Investment Owned Percent | [1] | 1.00% |  | 1.00% |
Electronics |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 10,623 |  | $ 10,866 |
Fair Value |  | $ 11,089 |  | $ 11,129 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Energy: Electricity |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  |  |  | $ 671 |
Fair Value |  |  |  | $ 671 |
Investment Owned Percent | [1] |  |  | 0.00% |
Energy: Oil & Gas |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 7,921 |  | $ 6,718 |
Fair Value |  | $ 2,355 |  | $ 1,056 |
Investment Owned Percent | [1] | 0.00% |  | 0.00% |
Environmental Industries |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 4,315 |  | $ 4,315 |
Fair Value |  | $ 4,200 |  | $ 4,930 |
Investment Owned Percent | [1] | 1.00% |  | 1.00% |
Finance |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 10,916 |  | $ 17,570 |
Fair Value |  | $ 10,912 |  | $ 17,581 |
Investment Owned Percent | [1] | 2.00% |  | 3.00% |
Forest Products & Paper |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 1,583 |  | $ 1,589 |
Fair Value |  | $ 1,271 |  | $ 1,373 |
Investment Owned Percent | [1] | 0.00% |  | 0.00% |
Healthcare, Education and Childcare |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 9,783 |  | $ 9,726 |
Fair Value |  | $ 9,752 |  | $ 9,586 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Healthcare & Pharmaceuticals |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 71,696 |  | $ 51,901 |
Fair Value |  | $ 62,275 |  | $ 50,566 |
Investment Owned Percent | [1] | 11.00% |  | 9.00% |
High Tech Industries |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 58,803 |  | $ 83,661 |
Fair Value |  | $ 58,715 |  | $ 73,994 |
Investment Owned Percent | [1] | 11.00% |  | 13.00% |
Hotel, Gaming & Leisure |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 4,906 |  | $ 10,245 |
Fair Value |  | $ 4,898 |  | $ 6,798 |
Investment Owned Percent | [1] | 1.00% |  | 1.00% |
Joint Venture |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 64,365 |  | $ 68,850 |
Fair Value |  | $ 60,474 |  | $ 58,955 |
Investment Owned Percent | [1] | 11.00% |  | 10.00% |
Machinery (Non-Agrclt/Constr/Electr) |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 7,748 |  | $ 9,461 |
Fair Value |  | $ 8,967 |  | $ 9,291 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Media: Advertising, Printing & Publishing |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 150 |  | $ 150 |
Fair Value |  | $ 246 |  | $ 549 |
Investment Owned Percent | [1] | 0.00% |  | 0.00% |
Media: Broadcasting & Subscription |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 12,407 |  | $ 14,930 |
Fair Value |  | $ 13,255 |  | $ 14,358 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Media: Diversified & Production |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 6,272 |  | $ 6,976 |
Fair Value |  | $ 6,365 |  | $ 6,572 |
Investment Owned Percent | [1] | 1.00% |  | 1.00% |
Metals & Mining |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 15,342 |  | $ 15,846 |
Fair Value |  | $ 13,647 |  | $ 14,786 |
Investment Owned Percent | [1] | 3.00% |  | 3.00% |
Retail |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 6,144 |  | $ 10,772 |
Fair Value |  | $ 6,775 |  | $ 10,871 |
Investment Owned Percent | [1] | 1.00% |  | 2.00% |
Services: Business |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 76,071 |  | $ 66,807 |
Fair Value |  | $ 77,798 |  | $ 66,207 |
Investment Owned Percent | [1] | 14.00% |  | 11.00% |
Services: Consumer |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 990 |  | $ 8,569 |
Fair Value |  | $ 990 |  | $ 8,128 |
Investment Owned Percent | [1] | 0.00% |  | 1.00% |
Telecommunications |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 7,521 |  | $ 11,475 |
Fair Value |  | $ 6,675 |  | $ 10,077 |
Investment Owned Percent | [1] | 1.00% |  | 2.00% |
Textiles and Leather |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 12,496 |  | $ 12,689 |
Fair Value |  | $ 11,095 |  | $ 12,808 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Transportation: Cargo |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  |  |  | $ 11,583 |
Fair Value |  |  |  | $ 11,342 |
Investment Owned Percent | [1] |  |  | 2.00% |
Transportation: Consumer |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 7,795 |  | $ 7,653 |
Fair Value |  | $ 7,837 |  | $ 7,335 |
Investment Owned Percent | [1] | 1.00% |  | 1.00% |
Senior Secured Loan |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 361,556 |  | $ 435,856 |
Fair Value |  | $ 364,701 | [4] | $ 418,722 | [5]
Investment Owned Percent | [2] | 66.00% |  | 73.00% |
Junior Secured Loan |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 82,996 |  | $ 65,776 |
Fair Value |  | $ 70,549 | [4] | $ 56,400 | [5]
Investment Owned Percent | [2] | 13.00% |  | 10.00% |
Senior Unsecured Bond |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 416 |  | $ 416 |
Fair Value |  | $ 43 | [4] | $ 43 | [5]
Investment Owned Percent | [2] | 0.00% |  | 0.00% |
Equity Securities |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 26,680 |  | $ 28,848 |
Fair Value |  | $ 22,586 |  | $ 21,905 |
Investment Owned Percent | [2] | 4.00% |  | 4.00% |
CLO Fund Securities |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 51,561 |  | $ 34,649 |
Fair Value |  | $ 31,632 |  | $ 20,453 | [5]
Investment Owned Percent | [2] | 6.00% |  | 3.00% |
Asset Manager Affiliates |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost | [6] | $ 17,791 |  | $ 17,791 |
Joint Ventures |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | 64,365 | [7] | 68,850 |
Fair Value |  | $ 60,474 | [7] | $ 58,955 | [5]
Investment Owned Percent | [2] | 11.00% |  | 10.00% |
Derivatives |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 31 | [7] | $ 31 |
Cost/Amortized Cost |  | 31 |  |  |
Fair Value | [7] | (2,412) |  |  |
Fair Value |  | $ (2,412) |  |  |
[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] | Reflects the fair market value of all investments as of December 31, 2021 as determined by the Company’s Board of Directors.
[5] | Reflects the fair market value of all investments as of December 31, 2022 as determined by the Company’s Board of Directors.
[6] | Represents the equity investment in the Asset Manager Affiliates.
[7] | The Company's investments are generally acquired in private transactions exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”) and, therefore, are generally subject to limitations on resale, and may be deemed to be “restricted securities'' under the Securities Act of 1933.

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