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Debt - Information about Senior Securities (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
SBA Debentures |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | $ 153,000 | $ 107,000 | $ 147,000 | $ 157,500 | $ 191,000 | $ 231,300 | $ 224,000 | $ 213,500 | $ 173,500 | $ 144,500
Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding Exclusive of Treasury Securities |  |  |  | $ 25,000 | $ 36,500 | $ 11,500 |  | $ 15,500 | $ 10,000 |
Asset Coverage per Unit | $ 2,800 | $ 2,822 | $ 2,337 | $ 2,989 | $ 5,659 | $ 35,198 |  | $ 16,959 | $ 25,326 |
2023 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding Exclusive of Treasury Securities |  |  | $ 50,000 | $ 50,000 | $ 50,000 |  |  |  |  |
Asset Coverage per Unit |  |  | $ 2,337 | $ 2,989 | $ 5,659 |  |  |  |  |
Average Market Value per Unit |  |  | $ 24.12 | $ 25.81 | $ 25.74 |  |  |  |  |
February 2024 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding Exclusive of Treasury Securities |  |  | $ 69,000 | $ 69,000 |  |  |  |  |  |
Asset Coverage per Unit |  |  | $ 2,337 | $ 2,989 |  |  |  |  |  |
Average Market Value per Unit |  |  | $ 24.60 | $ 25.97 |  |  |  |  |  |
November 2024 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding Exclusive of Treasury Securities |  |  | $ 63,250 | $ 63,250 |  |  |  |  |  |
Asset Coverage per Unit |  |  | $ 2,337 | $ 2,989 |  |  |  |  |  |
Average Market Value per Unit |  |  | $ 23.20 | $ 25.75 |  |  |  |  |  |
January 2026 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | $ 125,000 | $ 125,000 | $ 125,000 |  |  |  |  |  |  |
Asset Coverage per Unit | $ 2,800 | $ 2,822 | $ 2,337 |  |  |  |  |  |  |
November 2026 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | $ 125,000 | $ 125,000 |  |  |  |  |  |  |  |
Asset Coverage per Unit | $ 2,800 | $ 2,822 |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | $ 16,880 | $ 17,637 |  |  |  |  |  |  |  |
Asset Coverage per Unit | $ 2,800 | $ 2,822 |  |  |  |  |  |  |  |

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