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Debt - Additional Information (Details) - USD ($)						3 Months Ended		12 Months Ended
Debt - Additional Information (Details) - USD ($)	Aug. 17, 2022	Oct. 08, 2021	Dec. 23, 2020	Jun. 26, 2020	Apr. 24, 2019	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Debt Instrument [Line Items]
Debt instrument asset coverage percentage						311.10%		321.70%
Aggregate principal amount						$ 175,000,000		$ 210,000,000
Weighted average interest rate						4.568%	4.244%
Offering expenses						$ 8,310,000		9,367,000
Loss on extinguishment of debt						(521,000)
Secured borrowings						15,626,000		15,880,000
Aggregate amount of outstanding of senior securities						288,126,000		265,880,000
Fair value of loans included in investments						$ 15,613,000		15,800,000
Credit facility, interest rate per annum						0.851%	0.97%
SBA Debentures
Debt Instrument [Line Items]
Weighted average interest rate						4.316%	3.268%
Offering expenses						$ 4,824,000		5,528,000
Prepayment of debentures						$ 35,000,000
Debt instrument, maturity year range, start						2026
Debt instrument, maturity year range, end						2027
Loss on extinguishment of debt						$ (521,000)	$ 0
Debt instrument term						10 years
Interest rate payment term						semi-annually on March 1 and September 1
Unused commitments amount						$ 0		$ 0
Secured Borrowings
Debt Instrument [Line Items]
Weighted average interest rate						9.363%	8.685%	9.40%
4.75% Notes due 2026
Debt Instrument [Line Items]
Maturity date			Jan. 31, 2026
Aggregate principal amount			$ 125,000,000
Interest rate			4.75%
Net proceeds from the notes			$ 122,134,000
Underwriting discounts			$ 2,500,000
Percentage of public offering price			100.00%
Offering expenses			$ 366,000
Debt instrument, redemption description						The January 2026 Notes may be redeemed in whole or in part at any time or from time to time at our option subject to a make whole provision if redeemed before October 31, 2025 (the date falling three months prior to maturity) and at par thereafter. Interest on the January 2026 Notes is payable on January 31 and July 31 of each year. The Company does not intend to list the January 2026 Notes on any securities exchange or automated dealer quotation system.
3.50% Notes Due 2026
Debt Instrument [Line Items]
Maturity date		Nov. 15, 2026
Aggregate principal amount		$ 125,000,000
Interest rate		3.50%
Net proceeds from the notes		$ 122,177,000
Underwriting discounts		$ 2,500,000
Percentage of public offering price		99.996%
Offering expenses		$ 318,000
Debt instrument, redemption description						The November 2026 Notes may be redeemed in whole or in part at any time or from time to time at our option subject to a make whole provision if redeemed before August 15, 2026 (the date falling three months prior to maturity) and at par thereafter. Interest on the November 2026 Notes is payable on May 15 and November 15 of each year. The Company does not intend to list the November 2026 Notes on any securities exchange or automated dealer quotation system.
Revolving Credit Facility \| Credit Agreement \| ING Capital LLC
Debt Instrument [Line Items]
Maturity date	Aug. 17, 2027			Apr. 24, 2023
Interest rate after certain conditions satisfied	2.675%			2.50%
Asset coverage ratio	1.50%			2.00%
Senior asset coverage ratio	2.00%
Remaining unused portion of Credit Facility commitment percentage					0.50%
Performing first lien bank loans, minimum percentage					35.00%
Revolving Credit Facility \| Credit Agreement \| ING Capital LLC \| SOFR
Debt Instrument [Line Items]
Interest rate prior to certain conditions satisfied	3.00%			2.675%
Revolving Credit Facility \| Credit Agreement \| ING Capital LLC \| Maximum
Debt Instrument [Line Items]
Credit facility, interest rate per annum					2.675%
Credit facility commitment percentage					35.00%
Revolving Credit Facility \| Credit Agreement \| ING Capital LLC \| Minimum
Debt Instrument [Line Items]
Credit facility, interest rate per annum					2.50%