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Debt - Information about Senior Securities (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	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
SBA Debentures
Debt Instrument [Line Items]
Total Amount Outstanding Exclusive of Treasury Securities	$ 210,000	$ 153,000	$ 107,000	$ 147,000	$ 157,500	$ 191,000	$ 231,300	$ 224,000	$ 213,500	$ 173,500
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	$ 3,217	$ 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				$ 24.6	$ 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				$ 23.2	$ 25.75
January 2026 Notes
Debt Instrument [Line Items]
Total Amount Outstanding Exclusive of Treasury Securities	$ 125,000	$ 125,000	$ 125,000	$ 125,000
Asset Coverage per Unit	$ 3,217	$ 2,800	$ 2,822	$ 2,337
November 2026 Notes
Debt Instrument [Line Items]
Total Amount Outstanding Exclusive of Treasury Securities	$ 125,000	$ 125,000	$ 125,000
Asset Coverage per Unit	$ 3,217	$ 2,800	$ 2,822
Secured Borrowings
Debt Instrument [Line Items]
Total Amount Outstanding Exclusive of Treasury Securities	$ 15,880	$ 16,880	$ 17,637
Asset Coverage per Unit	$ 3,217	$ 2,800	$ 2,822