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Investments - Composition of the Company's Investment Portfolio by Industry, at Amortized Cost and Fair Value (with Corresponding Percentage of Total Portfolio Investments) (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2024

Dec. 31, 2023

Investments

$ 525,658

^[1]

$ 510,876

^[2]

Investments, at fair value

$ 500,889

^[1],[3]

$ 488,386

^[2],[4]

Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

100.00%

100.00%

Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

100.00%

100.00%

Aerospace & Defense

Investments

$ 0

$ 7,784

Investments, at fair value

$ 0

$ 7,876

Aerospace & Defense | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.00%

1.50%

Aerospace & Defense | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.00%

1.60%

Investments

$ 20,095

$ 19,781

Investments, at fair value

$ 17,924

$ 18,495

Automotive | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

3.80%

3.90%

Automotive | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

3.60%

3.80%

Investments

$ 16,326

$ 16,290

Investments, at fair value

$ 15,163

$ 15,385

Banking | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

3.10%

3.20%

Banking | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

3.00%

3.20%

Beverage, Food & Tobacco

Investments

$ 4,476

$ 4,481

Investments, at fair value

$ 6,187

$ 6,098

Beverage, Food & Tobacco | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.90%

0.90%

Beverage, Food & Tobacco | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

1.20%

1.20%

Capital Equipment

Investments

$ 4,855

$ 4,880

Investments, at fair value

$ 4,924

$ 4,893

Capital Equipment | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.90%

1.00%

Capital Equipment | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

1.00%

1.00%

Chemicals, Plastics & Rubber

Investments

$ 2,950

$ 2,934

Investments, at fair value

$ 3,525

$ 3,987

Chemicals, Plastics & Rubber | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.60%

0.60%

Chemicals, Plastics & Rubber | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.70%

0.80%

Construction & Building

Investments

$ 9,794

$ 8,689

Investments, at fair value

$ 9,937

$ 8,813

Construction & Building | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

1.80%

1.70%

Construction & Building | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

2.00%

1.80%

Consumer Goods: Durable

Investments

$ 8,149

$ 8,295

Investments, at fair value

$ 8,087

$ 8,242

Consumer Goods: Durable | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

1.50%

1.60%

Consumer Goods: Durable | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

1.60%

1.70%

Consumer Goods: Non-Durable

Investments

$ 3,547

$ 3,415

Investments, at fair value

$ 2,198

$ 2,387

Consumer Goods: Non-Durable | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.70%

0.70%

Consumer Goods: Non-Durable | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.50%

0.50%

Environmental Industries

Investments

$ 5,412

$ 5,421

Investments, at fair value

$ 5,871

$ 5,896

Environmental Industries | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

1.00%

1.10%

Environmental Industries | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

1.20%

1.20%

Investments

$ 15,122

$ 14,771

Investments, at fair value

$ 15,718

$ 15,388

FIRE: Finance | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

2.90%

2.90%

FIRE: Finance | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

3.10%

3.30%

FIRE: Real Estate

Investments

$ 90,609

$ 87,226

Investments, at fair value

$ 88,564

$ 85,153

FIRE: Real Estate | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

17.20%

17.10%

FIRE: Real Estate | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

17.70%

17.40%

Healthcare & Pharmaceuticals

Investments

$ 79,423

$ 70,992

Investments, at fair value

$ 78,105

$ 69,354

Healthcare & Pharmaceuticals | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

15.10%

13.90%

Healthcare & Pharmaceuticals | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

15.60%

14.20%

High Tech Industries

Investments

$ 41,329

$ 42,123

Investments, at fair value

$ 39,305

$ 40,723

High Tech Industries | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

7.90%

8.20%

High Tech Industries | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

7.80%

8.30%

Hotels, Gaming & Leisure

Investments

$ 111

$ 111

Investments, at fair value

$ 140

$ 110

Hotels, Gaming & Leisure | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.00%

0.00%

Hotels, Gaming & Leisure | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.00%

0.00%

Investment Funds & Vehicles

Investments

$ 42,650

$ 42,650

Investments, at fair value

$ 32,990

$ 33,122

Investment Funds & Vehicles | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

8.10%

8.30%

Investment Funds & Vehicles | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

6.60%

6.80%

Media: Advertising, Printing & Publishing

Investments

$ 18,213

$ 18,267

Investments, at fair value

$ 20,670

$ 20,238

Media: Advertising, Printing & Publishing | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

3.50%

3.60%

Media: Advertising, Printing & Publishing | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

4.10%

4.10%

Media: Broadcasting & Subscription

Investments

$ 4,486

$ 4,214

Investments, at fair value

$ 1,973

$ 2,217

Media: Broadcasting & Subscription | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.90%

0.80%

Media: Broadcasting & Subscription | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.40%

0.50%

Media: Diversified & Production

Investments

$ 42,385

$ 41,734

Investments, at fair value

$ 42,621

$ 41,897

Media: Diversified & Production | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

8.10%

8.20%

Media: Diversified & Production | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

8.50%

8.60%

Investments

$ 2,465

$ 2,443

Investments, at fair value

$ 1,886

$ 1,995

Retail | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.50%

0.50%

Retail | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.40%

0.40%

Services: Business

Investments

$ 58,848

$ 55,852

Investments, at fair value

$ 59,705

$ 56,655

Services: Business | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

11.20%

10.90%

Services: Business | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

11.90%

11.60%

Services: Consumer

Investments

$ 25,713

$ 25,283

Investments, at fair value

$ 17,244

$ 16,772

Services: Consumer | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

4.90%

4.90%

Services: Consumer | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

3.50%

3.40%

Telecommunications

Investments

$ 7,543

$ 7,262

Investments, at fair value

$ 7,746

$ 7,508

Telecommunications | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

1.40%

1.40%

Telecommunications | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

1.50%

1.50%

Transportation: Cargo

Investments

$ 4,893

$ 0

Investments, at fair value

$ 4,913

$ 0

Transportation: Cargo | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

0.90%

0.00%

Transportation: Cargo | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

1.00%

0.00%

Investments

$ 16,264

$ 15,978

Investments, at fair value

$ 15,493

$ 15,182

Wholesale | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

3.10%

3.10%

Wholesale | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk

Investments

Concentration risk, percentage

3.10%

3.10%

[1]	All of the Company’s investments are issued by eligible portfolio companies, as defined in the Investment Company Act of 1940 (the “1940 Act”), unless otherwise noted. All of the Company’s investments are issued by U.S. portfolio companies unless otherwise noted.
[2]	All of the Company's investments are issued by eligible portfolio companies, as defined in the Investment Company Act of 1940 (the “1940 Act”), unless otherwise noted. All of the Company's investments are issued by U.S. portfolio companies unless otherwise noted.
[3]	Because there is no readily available market value for these investments, the fair value of these investments is determined in good faith using significant unobservable inputs by the Valuation Designee. (See Note 4 in the accompanying notes to the consolidated financial statements).
[4]	Because there is no readily available market value for these investments, the fair value of these investments is determined in good faith using significant unobservable inputs by the Valuation Designee. (See Note 4 in the accompanying notes to the consolidated financial statements.)