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Investments - Company Portfolio by Security and Investment (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2021 | Sep. 30, 2022
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 605,365 | $ 605,365 | $ 630,191 |
Cost/Amortized Cost |  |  | 31 |  |
Cost/Amortized Cost |  | 605,396 | 605,396 |  |
Fair Value |  | 549,985 | 549,985 | $ 571,656 |
Fair Value |  | 2,412 | 2,412 |  |
Fair Value |  | $ 547,573 | $ 547,573 |  |
Investment Owned Percent | [1] | 100.00% | 100.00% | 100.00% |
Aerospace and Defense |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 11,730 | $ 11,730 | $ 10,764 |
Fair Value |  | $ 11,692 | $ 11,692 | $ 10,522 |
Investment Owned Percent | [1] | 2.00% | 2.00% | 2.00% |
Asset Management Company |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost | [2] | $ 17,791 | $ 17,791 | $ 17,791 |
Automotive |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | 11,331 | 11,331 | 12,007 |
Fair Value |  | $ 11,487 | $ 11,487 | $ 11,803 |
Investment Owned Percent | [1] | 2.00% | 2.00% | 2.00% |
Banking, Finance, Insurance & Real Estate |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 41,487 | $ 41,487 | $ 72,192 |
Fair Value |  | $ 42,858 | $ 42,858 | $ 74,457 |
Investment Owned Percent | [1] | 8.00% | 8.00% | 13.00% |
Beverage, Food and Tobacco |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 5,511 | $ 5,511 | $ 12,381 |
Fair Value |  | $ 5,625 | $ 5,625 | $ 12,237 |
Investment Owned Percent | [1] | 1.00% | 1.00% | 2.00% |
Capital Equipment |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 14,387 | $ 14,387 | $ 10,679 |
Fair Value |  | $ 10,620 | $ 10,620 | $ 6,915 |
Investment Owned Percent | [1] | 2.00% | 2.00% | 1.00% |
Chemicals, Plastics & Rubber |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 12,692 | $ 12,692 | $ 10,496 |
Fair Value |  | $ 12,969 | $ 12,969 | $ 10,379 |
Investment Owned Percent | [1] | 2.00% | 2.00% | 2.00% |
CLO Fund Securities |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 51,561 | $ 51,561 | $ 37,411 |
Fair Value |  | $ 31,632 | $ 31,632 | $ 24,623 |
Investment Owned Percent | [1] | 6.00% | 6.00% | 4.00% |
Construction & Building |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 8,966 | $ 8,966 | $ 10,481 |
Fair Value |  | $ 9,501 | $ 9,501 | $ 10,530 |
Investment Owned Percent | [1] | 2.00% | 2.00% | 2.00% |
Consumer goods: Durable |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 25,151 | $ 25,151 | $ 16,804 |
Fair Value |  | $ 24,831 | $ 24,831 | $ 13,852 |
Investment Owned Percent | [1] | 5.00% | 5.00% | 2.00% |
Consumer goods: Non-durable |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 4,162 | $ 4,162 | $ 2,187 |
Fair Value |  | $ 4,197 | $ 4,197 | $ 2,197 |
Investment Owned Percent | [1] | 1.00% | 1.00% | 0.00% |
Containers, Packaging and Glass |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 2,780 | $ 2,780 | $ 2,761 |
Fair Value |  | $ 2,570 | $ 2,570 | $ 2,661 |
Investment Owned Percent | [1] | 1.00% | 1.00% | 1.00% |
Electronics |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 10,623 | $ 10,623 | $ 10,809 |
Fair Value |  | $ 11,089 | $ 11,089 | $ 10,917 |
Investment Owned Percent | [1] | 2.00% | 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 | $ 7,921 | $ 6,718 |
Fair Value |  | $ 2,355 | $ 2,355 | $ 1,388 |
Investment Owned Percent | [1] | 0.00% | 0.00% | 0.00% |
Environmental Industries |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 4,315 | $ 4,315 | $ 4,315 |
Fair Value |  | $ 4,200 | $ 4,200 | $ 6,200 |
Investment Owned Percent | [1] | 1.00% | 1.00% | 1.00% |
Finance |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 10,916 | $ 10,916 | $ 7,759 |
Fair Value |  | $ 10,912 | $ 10,912 | $ 7,757 |
Investment Owned Percent | [1] | 2.00% | 2.00% | 1.00% |
Forest Products & Paper |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 1,583 | $ 1,583 | $ 1,587 |
Fair Value |  | $ 1,271 | $ 1,271 | $ 1,376 |
Investment Owned Percent | [1] | 0.00% | 0.00% | 0.00% |
Healthcare, Education and Childcare |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 9,783 | $ 9,783 | $ 9,740 |
Fair Value |  | $ 9,752 | $ 9,752 | $ 9,613 |
Investment Owned Percent | [1] | 2.00% | 2.00% | 2.00% |
Healthcare & Pharmaceuticals |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 71,696 | $ 71,696 | $ 49,296 |
Fair Value |  | $ 62,275 | $ 62,275 | $ 48,667 |
Investment Owned Percent | [1] | 11.00% | 11.00% | 9.00% |
High Tech Industries |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 58,803 | $ 58,803 | $ 79,358 |
Fair Value |  | $ 58,715 | $ 58,715 | $ 73,154 |
Investment Owned Percent | [1] | 11.00% | 11.00% | 13.00% |
Hotel, Gaming & Leisure |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 4,906 | $ 4,906 | $ 10,128 |
Fair Value |  | $ 4,898 | $ 4,898 | $ 8,823 |
Investment Owned Percent | [1] | 1.00% | 1.00% | 2.00% |
Joint Ventures |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 64,365 | $ 64,365 | $ 55,139 |
Fair Value |  | $ 60,474 | $ 60,474 | $ 45,141 |
Investment Owned Percent | [1] | 11.00% | 11.00% | 8.00% |
Machinery (Non-Agrclt/Constr/Electr) |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 7,748 | $ 7,748 | $ 9,524 |
Fair Value |  | $ 8,967 | $ 8,967 | $ 9,716 |
Investment Owned Percent | [1] | 2.00% | 2.00% | 2.00% |
Media: Advertising, Printing & Publishing |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 150 | $ 150 | $ 150 |
Fair Value |  | $ 246 | $ 246 | 281 |
Investment Owned Percent | [1] | 0.00% | 0.00% |  |
Media: Broadcasting & Subscription |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 12,407 | $ 12,407 | 13,081 |
Fair Value |  | $ 13,255 | $ 13,255 | $ 13,848 |
Investment Owned Percent | [1] | 2.00% | 2.00% | 2.00% |
Media: Diversified & Production |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 6,272 | $ 6,272 | $ 7,160 |
Fair Value |  | $ 6,365 | $ 6,365 | $ 7,175 |
Investment Owned Percent | [1] | 1.00% | 1.00% | 1.00% |
Metals & Mining |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 15,342 | $ 15,342 | $ 15,763 |
Fair Value |  | $ 13,647 | $ 13,647 | $ 15,052 |
Investment Owned Percent | [1] | 3.00% | 3.00% | 3.00% |
Retail |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 6,144 | $ 6,144 | $ 10,748 |
Fair Value |  | $ 6,775 | $ 6,775 | $ 10,787 |
Investment Owned Percent | [1] | 1.00% | 1.00% | 2.00% |
Services: Business |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 76,071 | $ 76,071 | $ 72,599 |
Fair Value |  | $ 77,798 | $ 77,798 | $ 73,124 |
Investment Owned Percent | [1] | 14.00% | 14.00% | 13.00% |
Services: Consumer |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 990 | $ 990 | $ 8,347 |
Fair Value |  | $ 990 | $ 990 | $ 7,980 |
Investment Owned Percent | [1] | 0.00% | 0.00% | 1.00% |
Telecommunications |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 7,521 | $ 7,521 | $ 9,473 |
Fair Value |  | $ 6,675 | $ 6,675 | $ 8,541 |
Investment Owned Percent | [1] | 1.00% | 1.00% | 2.00% |
Textiles and Leather |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 12,496 | $ 12,496 | $ 12,640 |
Fair Value |  | $ 11,095 | $ 11,095 | $ 12,408 |
Investment Owned Percent | [1] | 2.00% | 2.00% | 2.00% |
Transportation: Cargo |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  |  |  | $ 11,566 |
Fair Value |  |  |  | $ 11,484 |
Investment Owned Percent | [1] |  |  | 2.00% |
Transportation: Consumer |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 7,795 | $ 7,795 | $ 7,666 |
Fair Value |  | $ 7,837 | $ 7,837 | $ 7,377 |
Investment Owned Percent | [1] | 1.00% | 1.00% | 1.00% |
Senior Secured Loan |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 361,556 | $ 361,556 | $ 426,052 |
Fair Value |  | $ 364,701 | $ 364,701 | $ 415,819 | [3]
Investment Owned Percent |  | 66.00% | 66.00% | 73.00% |
Junior Secured Loan |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 82,996 | $ 82,996 | $ 65,672 |
Fair Value |  | $ 70,549 | $ 70,549 | $ 61,535 | [3]
Investment Owned Percent |  | 13.00% | 13.00% | 11.00% |
Senior Unsecured Bond |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 416 | $ 416 | $ 416 |
Fair Value |  | $ 43 | $ 43 | $ 43 | [3]
Investment Owned Percent |  | 0.00% | 0.00% | 0.00% |
Equity Securities |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 26,680 | $ 26,680 | $ 27,679 |
Fair Value |  | $ 22,586 | $ 22,586 | $ 24,487 | [3]
Investment Owned Percent |  | 4.00% | 4.00% | 4.00% |
CLO Fund Securities |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 51,561 | $ 51,561 | $ 37,411 |
Fair Value |  | $ 31,632 | $ 31,632 | $ 24,623 | [3]
Investment Owned Percent |  | 6.00% | 6.00% | 4.00% |
Asset Manager Affiliates |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 17,791 | $ 17,791 | $ 17,791 |
Joint Ventures |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | 64,365 | 64,365 | 55,139 |
Fair Value |  | $ 60,474 | $ 60,474 | $ 45,141 | [3]
Investment Owned Percent |  | 11.00% | 11.00% | 8.00% |
Derivatives |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Cost/Amortized Cost |  | $ 31 | $ 31 | $ 31 |
Cost/Amortized Cost |  | 31 |  |  |
Fair Value |  | (2,412) | (2,412) | $ 8 | [3]
Fair Value |  | $ (2,412) | $ (2,412) |  |
Investment Owned Percent |  |  |  | 0.00% |
[1] | Calculated as a percentage of total portfolio at fair value.
[2] | Represents the equity investment in the Asset Manager Affiliates
[3] | Reflects the fair market value of all investments as of September 30, 2022 as determined by the Company’s Board of Directors.

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