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Investments - Composition of the Company's Investment Portfolio by Geographic Region, at Amortized Cost and Fair Value (with Corresponding Percentage of Total Portfolio Investments) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Investments |  |  |  |
Amortized Cost | $ 525,658,000 | [1] | $ 510,876,000 | [2]
Fair Value | $ 500,889,000 | [1],[3] | $ 488,386,000 | [2],[4]
Investment Owned, At Cost | Geographic Concentration Risk |  |  |  |
Investments |  |  |  |
Concentration risk, percentage | 100.00% |  | 100.00% |
Investment Owned, At Fair Value | Geographic Concentration Risk |  |  |  |
Investments |  |  |  |
Concentration risk, percentage | 100.00% |  | 100.00% |
Midwest |  |  |  |
Investments |  |  |  |
Amortized Cost | $ 165,246,000 |  | $ 158,383,000 |
Fair Value | $ 140,869,000 |  | $ 135,352,000 |
Midwest | Investment Owned, At Cost | Geographic Concentration Risk |  |  |  |
Investments |  |  |  |
Concentration risk, percentage | 31.40% |  | 31.00% |
Midwest | Investment Owned, At Fair Value | Geographic Concentration Risk |  |  |  |
Investments |  |  |  |
Concentration risk, percentage | 28.10% |  | 27.70% |
Northeast |  |  |  |
Investments |  |  |  |
Amortized Cost | $ 112,794,000 |  | $ 108,707,000 |
Fair Value | $ 113,827,000 |  | $ 110,180,000 |
Northeast | Investment Owned, At Cost | Geographic Concentration Risk |  |  |  |
Investments |  |  |  |
Concentration risk, percentage | 21.40% |  | 21.30% |
Northeast | Investment Owned, At Fair Value | Geographic Concentration Risk |  |  |  |
Investments |  |  |  |
Concentration risk, percentage | 22.70% |  | 22.60% |
Southeast |  |  |  |
Investments |  |  |  |
Amortized Cost | $ 143,960,000 |  | $ 134,899,000 |
Fair Value | $ 140,731,000 |  | $ 130,595,000 |
Southeast | Investment Owned, At Cost | Geographic Concentration Risk |  |  |  |
Investments |  |  |  |
Concentration risk, percentage | 27.40% |  | 26.40% |
Southeast | Investment Owned, At Fair Value | Geographic Concentration Risk |  |  |  |
Investments |  |  |  |
Concentration risk, percentage | 28.10% |  | 26.80% |
Southwest |  |  |  |
Investments |  |  |  |
Amortized Cost | $ 17,690,000 |  | $ 25,163,000 |
Fair Value | $ 18,092,000 |  | $ 25,610,000 |
Southwest | Investment Owned, At Cost | Geographic Concentration Risk |  |  |  |
Investments |  |  |  |
Concentration risk, percentage | 3.40% |  | 4.90% |
Southwest | Investment Owned, At Fair Value | Geographic Concentration Risk |  |  |  |
Investments |  |  |  |
Concentration risk, percentage | 3.60% |  | 5.20% |
West |  |  |  |
Investments |  |  |  |
Amortized Cost | $ 85,968,000 |  | $ 83,724,000 |
Fair Value | 87,370,000 |  | 86,649,000 |
West | One International Portfolio Investment |  |  |  |
Investments |  |  |  |
Amortized Cost | 0 |  | 0 |
Fair Value | $ 1,763,000 |  | $ 1,695,000 |
West | Investment Owned, At Cost | Geographic Concentration Risk |  |  |  |
Investments |  |  |  |
Concentration risk, percentage | 16.40% |  | 16.40% |
West | Investment Owned, At Fair Value | Geographic Concentration Risk |  |  |  |
Investments |  |  |  |
Concentration risk, percentage | 17.50% |  | 17.70% |
[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.)

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