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Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 145 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2023 | Jul. 21, 2023 | May 02, 2023 | Feb. 15, 2023 | Nov. 03, 2022 | May 02, 2022 | Feb. 15, 2022 | Nov. 01, 2021 | Aug. 02, 2021 | May 03, 2021 | Feb. 09, 2021 | Aug. 02, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2023 | Jul. 19, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 895,168 | [1],[2],[3] |  | $ 895,168 | [1],[2],[3] |  | $ 828,693 | [4],[5],[6] |
Dividends to stockholders |  |  | $ 0.41 | $ 0.41 |  | $ 0.36 | $ 0.36 | $ 0.32 | $ 0.32 | $ 0.31 | $ 0.31 |  | $ 1.36 |  |  | $ 1.36 |  |  | $ 2 |  | $ 1.6
Dividend payable date |  |  | Jun. 28, 2023 | Mar. 29, 2023 |  | Jun. 24, 2022 | Mar. 25, 2022 | Dec. 17, 2021 | Sep. 28, 2021 | Jun. 28, 2021 | Mar. 26, 2021 |  |  |  |  |  |  |  |  |  |
Dividend record date |  |  | Jun. 21, 2023 | Mar. 22, 2023 |  | Jun. 10, 2022 | Mar. 11, 2022 | Dec. 03, 2021 | Sep. 14, 2021 | Jun. 14, 2021 | Mar. 12, 2021 |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared date | Jul. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable date | Sep. 27, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend record date | Sep. 20, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares Sold |  |  |  |  |  |  |  |  |  |  |  |  | 246,574 |  | 260,610 |  |  |  |  |  |
DealerBuilt Acquisition, LLC | First Lien Debt, Subordinated Debt, Common Equity and Preferred Equity | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment acquisition date |  | Jul. 21, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  | $ 19,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Dividend | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders | $ 0.41 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  | $ 0.19 | $ 0.15 | $ 0.08 | $ 0.07 | $ 0.17 | $ 0.04 | $ 0.06 | $ 0.08 | $ 0.07 |  |  |  |  |  |  |  |  |  |
Dividend payable date |  |  | Jun. 28, 2023 | Mar. 29, 2023 | Dec. 16, 2022 | Jun. 24, 2022 | Mar. 25, 2022 | Dec. 17, 2021 | Sep. 28, 2021 | Jun. 28, 2021 | Mar. 26, 2021 |  |  |  |  |  |  |  |  |  |
Dividend record date |  |  | Jun. 21, 2023 | Mar. 22, 2023 | Dec. 02, 2022 | Jun. 10, 2022 | Mar. 11, 2022 | Dec. 03, 2021 | Sep. 14, 2021 | Jun. 14, 2021 | Mar. 12, 2021 |  |  |  |  |  |  |  |  |  |
Supplemental Dividend | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders | 0.21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  | $ 0.1 | $ 0.1 | $ 0.1 |  |  | $ 0.05 | $ 0.04 |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable date |  |  | Jun. 28, 2023 |  | Dec. 16, 2022 |  |  | Dec. 17, 2021 | Sep. 28, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Dividend record date |  |  | Jun. 21, 2023 | Mar. 22, 2023 | Dec. 02, 2022 |  |  | Dec. 03, 2021 | Sep. 14, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Special Dividend | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders | $ 0.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At-the-Market Offering Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,203 |  |  |  |  |
Net proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,960 |  |  |  |  |
At-the-Market Offering Program | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds |  |  |  |  |  |  |  |  |  |  |  | $ 990 |  |  |  |  |  |  |  |  |
Net proceeds |  |  |  |  |  |  |  |  |  |  |  | $ 976 |  |  |  |  |  |  |  |  |
At-the-Market Offering Program | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 797,572 |  |  |  |  |
At-the-Market Offering Program | Common Stock | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares Sold |  |  |  |  |  |  |  |  |  |  |  | 50,264 |  |  |  |  |  |  |  |  |
SBA Debentures | 6.035% Fixed Interest Rate | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000 |  |  |
Debt instrument interim interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.035% |  |  |
[1] | (a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[2] | (b) Equity ownership may be held in shares or units of companies related to the portfolio companies.
[3] | (c) All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.
[4] | (a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[5] | (b) Equity ownership may be held in shares or units of companies related to the portfolio companies.
[6] | (c) All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.

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