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Investments - Company Portfolio by Security and Investment (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 522,683 | $ 540,282
Fair Value |  | $ 444,370 | $ 467,865
Fair Value Percentage of Total Portfolio |  | 100.00% | 100.00%
Aerospace and Defense |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 11,137 | $ 11,130
Fair Value |  | $ 11,255 | $ 11,256
Fair Value Percentage of Total Portfolio |  | 2.50% | 2.40%
Alternative Carriers |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  |  | $ 971
Fair Value |  |  | $ 937
Fair Value Percentage of Total Portfolio |  | 0.00% | 0.20%
Application Software |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 1,165 | $ 0
Fair Value |  | $ 1,153 | $ 0
Fair Value Percentage of Total Portfolio |  | 0.30% | 0.00%
Asset Management Company |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost | [1] | $ 17,791 | $ 17,791
Fair Value Percentage of Total Portfolio | [1] | 0.00% | 0.00%
Banking, Finance, Insurance & Real Estate |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 48,313 | $ 51,486
Fair Value |  | $ 49,325 | $ 53,918
Fair Value Percentage of Total Portfolio |  | 11.10% | 11.50%
Beverage, Food and Tobacco |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 12,547 | $ 12,220
Fair Value |  | $ 11,775 | $ 11,444
Fair Value Percentage of Total Portfolio |  | 2.60% | 2.40%
Capital Equipment |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 10,806 | $ 10,684
Fair Value |  | $ 1,435 | $ 1,203
Fair Value Percentage of Total Portfolio |  | 0.30% | 0.30%
Chemicals, Plastics and Rubber |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 9,705 | $ 9,738
Fair Value |  | $ 9,704 | $ 9,836
Fair Value Percentage of Total Portfolio |  | 2.20% | 2.10%
CLO Fund Securities |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 8,423 | $ 9,103
Fair Value |  | $ 7,354 | $ 8,968
Fair Value Percentage of Total Portfolio |  | 1.70% | 1.90%
Construction & Building |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 7,701 | $ 7,737
Fair Value |  | $ 7,344 | $ 7,441
Fair Value Percentage of Total Portfolio |  | 1.70% | 1.60%
Consumer goods: Durable |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 24,447 | $ 16,431
Fair Value |  | $ 22,093 | $ 13,898
Fair Value Percentage of Total Portfolio |  | 5.00% | 3.00%
Containers, Packaging and Glass |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 2,731 | $ 2,734
Fair Value |  | $ 2,679 | $ 2,665
Fair Value Percentage of Total Portfolio |  | 0.60% | 0.60%
Diversified Financial Services |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 2,733 |
Fair Value |  | $ 2,756 |
Fair Value Percentage of Total Portfolio |  | 0.60% | 0.00%
Energy: Electricity |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 671 | $ 671
Fair Value |  | $ 671 | $ 671
Fair Value Percentage of Total Portfolio |  | 0.20% | 0.10%
Energy: Oil & Gas |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 76 | $ 6,721
Fair Value |  | $ 0 | $ 100
Fair Value Percentage of Total Portfolio |  | 0.00% | 0.00%
Finance |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 19,059 | $ 18,884
Fair Value |  | $ 19,135 | $ 18,972
Fair Value Percentage of Total Portfolio |  | 4.30% | 4.10%
Healthcare & Pharmaceuticals |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 56,541 | $ 59,189
Fair Value |  | $ 55,044 | $ 57,224
Fair Value Percentage of Total Portfolio |  | 12.40% | 12.20%
Healthcare, Education and Childcare |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 6,143 | $ 6,175
Fair Value |  | $ 6,133 | $ 6,163
Fair Value Percentage of Total Portfolio |  | 1.40% | 1.30%
High Tech Industries |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 69,749 | $ 84,676
Fair Value |  | $ 52,766 | $ 73,430
Fair Value Percentage of Total Portfolio |  | 11.90% | 15.70%
Hotel, Gaming & Leisure |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 7,006 | $ 8,358
Fair Value |  | $ 2,543 | $ 3,948
Fair Value Percentage of Total Portfolio |  | 0.60% | 0.80%
Interactive Media & Services |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 2,596 | $ 2,663
Fair Value |  | $ 2,606 | $ 2,662
Fair Value Percentage of Total Portfolio |  | 0.60% | 0.60%
IT Consulting & Other Services |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 2,213 | $ 2,213
Fair Value |  | $ 2,320 | $ 2,259
Fair Value Percentage of Total Portfolio |  | 0.50% | 0.50%
Joint Venture |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 65,775 | $ 71,415
Fair Value |  | $ 54,292 | $ 59,287
Fair Value Percentage of Total Portfolio |  | 12.20% | 12.70%
Machinery (Non-Agrclt/Constr/Electr) |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 11,609 | $ 9,836
Fair Value |  | $ 12,257 | $ 10,097
Fair Value Percentage of Total Portfolio |  | 2.70% | 2.20%
Media: Broadcasting & Subscription |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 17,528 | $ 16,665
Fair Value |  | $ 13,294 | $ 14,618
Fair Value Percentage of Total Portfolio |  | 3.00% | 3.10%
Media: Diversified & Production |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 374 | $ 1,121
Fair Value |  | $ 375 | $ 1,125
Fair Value Percentage of Total Portfolio |  | 0.10% | 0.20%
Metals & Mining |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 9,951 | $ 9,000
Fair Value |  | $ 5,992 | $ 7,742
Fair Value Percentage of Total Portfolio |  | 1.30% | 1.70%
Retail |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 9,518 | $ 9,334
Fair Value |  | $ 8,399 | $ 8,732
Fair Value Percentage of Total Portfolio |  | 1.90% | 1.90%
Services: Business |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 63,842 | $ 58,997
Fair Value |  | $ 60,817 | $ 57,168
Fair Value Percentage of Total Portfolio |  | 13.70% | 12.20%
Services: Consumer |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 2,639 |
Fair Value |  | $ 2,639 |
Fair Value Percentage of Total Portfolio |  | 0.60% | 0.00%
Telecommunications |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 5,303 | $ 5,268
Fair Value |  | $ 4,629 | $ 4,389
Fair Value Percentage of Total Portfolio |  | 0.90% | 0.90%
Transportation: Cargo |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 7,153 | $ 11,606
Fair Value |  | $ 6,075 | $ 10,303
Fair Value Percentage of Total Portfolio |  | 1.40% | 2.20%
Transportation: Consumer |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 7,438 | $ 7,465
Fair Value |  | $ 7,510 | $ 7,409
Fair Value Percentage of Total Portfolio |  | 1.70% | 1.60%
First Lien Debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 343,264 | $ 351,858
Fair Value |  | $ 320,815 | $ 336,599
Fair Value Percentage of Total Portfolio |  | 72.10% | 71.90%
Second Lien Debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 48,750 | $ 50,814
Fair Value |  | $ 36,386 | $ 41,254
Fair Value Percentage of Total Portfolio |  | 8.20% | 8.80%
Subordinated Debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 8,055 | $ 7,990
Fair Value |  | $ 1,693 | $ 1,224
Fair Value Percentage of Total Portfolio |  | 0.40% | 0.30%
Collateral Loan Obligations |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 8,423 | $ 9,103
Fair Value |  | $ 7,354 | $ 8,968
Fair Value Percentage of Total Portfolio |  | 1.70% | 1.90%
Joint Ventures |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 65,775 | $ 71,415
Fair Value |  | $ 54,292 | $ 59,287
Fair Value Percentage of Total Portfolio |  | 12.20% | 12.70%
Equity |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 30,594 | $ 31,280
Fair Value |  | $ 23,830 | $ 20,533
Fair Value Percentage of Total Portfolio |  | 5.40% | 4.40%
Asset Manager Affiliates |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost | [2] | $ 17,791 | $ 17,791
Derivatives |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 31 | $ 31
[1] | Represents the equity investment in the Asset Manager Affiliates
[2] | Represents the equity investment in the Asset Manager Affiliates.

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