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Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |
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Feb. 28, 2023 | Feb. 23, 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 | Oct. 26, 2020 | Aug. 03, 2020 | Apr. 29, 2020 | Feb. 14, 2020 | Feb. 28, 2023 | Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 01, 2023 | Feb. 27, 2023
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 828,693 | $ 828,693 | $ 621,786 |  |  |
Dividends to stockholders |  |  |  |  | $ 0.36 | $ 0.36 | $ 0.32 | $ 0.32 | $ 0.31 | $ 0.31 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.39 |  | $ 2.00 | $ 2.00 | $ 1.60 | $ 1.33 |  |
Dividend payable date |  |  |  |  | Jun. 24, 2022 | Mar. 25, 2022 | Dec. 17, 2021 | Sep. 28, 2021 | Jun. 28, 2021 | Mar. 26, 2021 | Dec. 18, 2020 | Sep. 25, 2020 | Jun. 26, 2020 | Mar. 27, 2020 |  |  |  |  |  |  |
Dividend record date |  |  |  |  | Jun. 10, 2022 | Mar. 11, 2022 | Dec. 03, 2021 | Sep. 14, 2021 | Jun. 14, 2021 | Mar. 12, 2021 | Dec. 04, 2020 | Sep. 11, 2020 | Jun. 12, 2020 | Mar. 13, 2020 |  |  |  |  |  |  |
Net proceeds from common stock under ATM program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,811 |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 290,388 | 0 | 0 |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  | Feb. 15, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable date |  |  | Mar. 29, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend record date |  |  | Mar. 22, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events | ATM Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds received |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,395 |  |  |  |  |  |
Net proceeds from common stock under ATM program |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,359 |  |  |  |  |  |
Subsequent Events | Common Stock | ATM Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 114,904 |  |  |  |  |  |
Subsequent Events | 5.344% Fixed Interest Rate | SBA Debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000
Debt instrument interim interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.344%
QED Parent Holdings, Inc. | First Lien Debt | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,750 |
CTM Group, Inc. | First Lien Debt, Subordinated Debt and Common Equity | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost | $ 10,400 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,400 |  |  |  |  |  |
Investment Date | Feb. 28, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
USG AS Holdings, LLC, | First Lien Debt | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  | $ 11,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Date |  | Feb. 23, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Dividend | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  | $ 0.41 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  | $ 0.08 | $ 0.07 | $ 0.17 | $ 0.04 | $ 0.06 | $ 0.08 | $ 0.07 | $ 0.04 |  |  |  |  |  |  |  |  |  |
Dividend payable date |  |  |  | Dec. 16, 2022 | Jun. 24, 2022 | Mar. 25, 2022 | Dec. 17, 2021 | Sep. 28, 2021 | Jun. 28, 2021 | Mar. 26, 2021 | Dec. 18, 2020 |  |  |  |  |  |  |  |  |  |
Dividend record date |  |  |  | Dec. 02, 2022 | Jun. 10, 2022 | Mar. 11, 2022 | Dec. 03, 2021 | Sep. 14, 2021 | Jun. 14, 2021 | Mar. 12, 2021 | Dec. 04, 2020 |  |  |  |  |  |  |  |  |  |
Supplemental Dividend | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  | 0.15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  | $ 0.10 |  |  | $ 0.05 | $ 0.04 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable date |  |  |  | Dec. 16, 2022 |  |  | Dec. 17, 2021 | Sep. 28, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend record date |  |  |  | Dec. 02, 2022 |  |  | Dec. 03, 2021 | Sep. 14, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Special Dividend | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  | $ 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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