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Investments - Company Portfolio by Security and Investment (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 543,601 |  | $ 540,282 |
Fair Value |  | $ 471,255 |  | $ 467,865 |
Investment Owned Percent | [1] | 100.00% |  | 100.00% | [2]
Aerospace and Defense |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 11,134 |  | $ 11,130 |
Fair Value |  | $ 11,260 |  | $ 11,256 |
Investment Owned Percent |  | 2.00% | [1] | 2.00% | [2]
Alternative Carriers |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  |  |  | $ 971 |
Fair Value |  |  |  | $ 937 |
Investment Owned Percent | [2] |  |  | 0.00% |
Application Software |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 1,163 |  | $ 0 |
Fair Value |  | $ 1,162 |  | $ 0 |
Investment Owned Percent | [2] | 0.00% |  | 0.00% |
Asset Management Company |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 17,791 | [3] | $ 17,791 | [4]
Banking, Finance, Insurance & Real Estate |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | 49,725 |  | 51,486 |
Fair Value |  | $ 51,332 |  | $ 53,918 |
Investment Owned Percent |  | 11.00% | [1] | 11.00% | [2]
Beverage, Food and Tobacco |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 12,288 |  | $ 12,220 |
Fair Value |  | $ 11,531 |  | $ 11,444 |
Investment Owned Percent |  | 2.00% | [1] | 2.00% | [2]
Capital Equipment |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 10,668 |  | $ 10,684 |
Fair Value |  | $ 972 |  | $ 1,203 |
Investment Owned Percent |  | 0.00% | [1] | 0.00% | [2]
Chemicals, Plastics and Rubber |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 9,498 |  | $ 9,738 |
Fair Value |  | $ 9,498 |  | $ 9,836 |
Investment Owned Percent |  | 2.00% | [1] | 2.00% | [2]
CLO Fund Securities |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 8,762 |  | $ 9,103 |
Fair Value |  | $ 8,549 |  | $ 8,968 |
Investment Owned Percent |  | 2.00% | [1] | 2.00% | [2]
Construction & Building |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 7,718 |  | $ 7,737 |
Fair Value |  | $ 7,481 |  | $ 7,441 |
Investment Owned Percent |  | 2.00% | [1] | 2.00% | [2]
Consumer goods: Durable |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 24,577 |  | $ 16,431 |
Fair Value |  | $ 21,869 |  | $ 13,898 |
Investment Owned Percent |  | 4.00% | [1] | 3.00% | [2]
Containers, Packaging and Glass |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 2,733 |  | $ 2,734 |
Fair Value |  | $ 2,673 |  | $ 2,665 |
Investment Owned Percent |  | 1.00% | [1] | 1.00% | [2]
Diversified Financial Services |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 2,699 |  |  |
Fair Value |  | $ 2,696 |  |  |
Investment Owned Percent |  | 1.00% |  |  |
Energy: Electricity |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 671 |  | $ 671 |
Fair Value |  | $ 671 |  | $ 671 |
Investment Owned Percent |  | 0.00% | [1] | 0.00% | [2]
Energy: Oil & Gas |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 6,304 |  | $ 6,721 |
Fair Value |  | $ 0 |  | $ 100 |
Investment Owned Percent |  | 0.00% | [1] | 0.00% | [2]
Finance |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 19,643 |  | $ 18,884 |
Fair Value |  | $ 19,702 |  | $ 18,972 |
Investment Owned Percent |  | 4.00% | [1] | 4.00% | [2]
Healthcare & Pharmaceuticals |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 57,350 |  | $ 59,189 |
Fair Value |  | $ 56,094 |  | $ 57,224 |
Investment Owned Percent |  | 12.00% | [1] | 12.00% | [2]
Healthcare, Education and Childcare |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 6,161 |  | $ 6,175 |
Fair Value |  | $ 6,150 |  | $ 6,163 |
Investment Owned Percent |  | 1.00% | [1] | 1.00% | [2]
High Tech Industries |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 83,452 |  | $ 84,676 |
Fair Value |  | $ 72,617 |  | $ 73,430 |
Investment Owned Percent |  | 15.00% | [1] | 16.00% | [2]
Hotel, Gaming & Leisure |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 8,353 |  | $ 8,358 |
Fair Value |  | $ 4,034 |  | $ 3,948 |
Investment Owned Percent | [2] | 1.00% | [1] | 1.00% |
Interactive Media & Services |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 2,625 |  | $ 2,663 |
Fair Value |  | $ 2,639 |  | $ 2,662 |
Investment Owned Percent | [2] | 1.00% |  | 1.00% |
IT Consulting & Other Services |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 2,213 |  | $ 2,213 |
Fair Value |  | $ 2,267 |  | $ 2,259 |
Investment Owned Percent | [2] | 1.00% |  | 1.00% |
Joint Venture |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 65,008 |  | $ 71,415 |
Fair Value |  | $ 53,164 |  | $ 59,287 |
Investment Owned Percent |  | 11.00% | [1] | 13.00% | [2]
Machinery (Non-Agrclt/Constr/Electr) |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 11,378 |  | $ 9,836 |
Fair Value |  | $ 11,975 |  | $ 10,097 |
Investment Owned Percent |  | 2.00% | [1] | 2.00% | [2]
Media: Broadcasting & Subscription |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 17,094 |  | $ 16,665 |
Fair Value |  | $ 14,044 |  | $ 14,618 |
Investment Owned Percent |  | 3.00% | [1] | 3.00% | [2]
Media: Diversified & Production |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 748 |  | $ 1,121 |
Fair Value |  | $ 750 |  | $ 1,125 |
Investment Owned Percent |  | 0.00% | [1] | 0.00% | [2]
Metals & Mining |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 9,500 |  | $ 9,000 |
Fair Value |  | $ 8,051 |  | $ 7,742 |
Investment Owned Percent |  | 2.00% | [1] | 2.00% | [2]
Retail |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 9,510 |  | $ 9,334 |
Fair Value |  | $ 9,029 |  | $ 8,732 |
Investment Owned Percent |  | 2.00% | [1] | 2.00% | [2]
Services: Business |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 61,116 |  | $ 58,997 |
Fair Value |  | $ 59,607 |  | $ 57,168 |
Investment Owned Percent |  | 13.00% | [1] | 12.00% | [2]
Telecommunications |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 5,305 |  | $ 5,268 |
Fair Value |  | $ 4,637 |  | $ 4,389 |
Investment Owned Percent |  | 1.00% | [1] | 1.00% | [2]
Transportation: Cargo |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 10,962 |  | $ 11,606 |
Fair Value |  | $ 9,416 |  | $ 10,303 |
Investment Owned Percent |  | 2.00% | [1] | 2.00% | [2]
Transportation: Consumer |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 7,452 |  | $ 7,465 |
Fair Value |  | $ 7,385 |  | $ 7,409 |
Investment Owned Percent |  | 2.00% | [1] | 2.00% | [2]
Senior Secured Loan |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 364,981 |  | $ 356,358 |
Fair Value |  | $ 349,844 |  | $ 340,159 |
Investment Owned Percent | [1] | 74.00% |  | 73.00% |
Junior Secured Loan |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 52,951 |  | $ 53,888 |
Fair Value |  | $ 36,270 |  | $ 38,875 |
Investment Owned Percent | [1] | 8.00% |  | 8.00% |
Senior Unsecured Bond |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  |  |  | $ 416 |
Fair Value |  |  |  | $ 43 |
Investment Owned Percent | [1] | 0.00% |  | 0.00% |
Equity Securities |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 34,077 |  | $ 31,280 |
Fair Value |  | $ 23,428 |  | $ 20,533 |
Investment Owned Percent | [1] | 5.00% |  | 4.00% |
CLO Fund Securities |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 8,762 |  | $ 9,103 |
Fair Value |  | $ 8,549 |  | $ 8,968 |
Investment Owned Percent | [1] | 2.00% |  | 2.00% |
Asset Manager Affiliates |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost | [3] | $ 17,791 |  | $ 17,791 |
Joint Ventures |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | 65,008 |  | 71,415 |
Fair Value |  | $ 53,164 |  | $ 59,287 |
Investment Owned Percent | [1] | 11.00% |  | 13.00% |
Derivatives |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 31 |  | $ 31 |
[1] | Represents percentage of total portfolio at fair value.
[2] | Calculated as a 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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