Agreements and Related Party Transactions - Additional Information (Details) - USD ($)		3 Months Ended		12 Months Ended
	Mar. 09, 2023	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Related Party Transaction [Line Items]
Administrative services expenses		$ 426,000	$ 329,000
Other payable to administrator		$ 692,000		$ 511,000
Annual base management fee calculation in percentage of gross assets		1.25%
Management fee, description		Under the terms of the Investment Advisory Agreement, t
Management fee		$ 4,456,000	4,015,000
Management fees waiver		46,000	56,000
Management fees payable		$ 4,410,000		4,056,000
Income incentive fee percent payable quarterly in excess of pre-incentive fee net investment income		100.00%
Income incentive fee quarterly return on investment income percent		1.75%
Income incentive fee annual return on investment income percent		7.00%
Percent of pre-incentive fee net investment income received to obtain catch-up feature		17.50%
Pre-incentive fee net investment income percent catch-up		2.1212%
Pre-incentive fee net investment income percent in excess of catch-up		17.50%
Capital gains incentive fee percent payable annually		17.50%
Income incentive fee incurred		$ 3,692,000	2,718,000
Income incentive fee waived		89,000	44,000
Income incentive fees unpaid		$ 3,603,000		$ 3,112,000
Incentive fee on cumulative unrealized capital appreciation description.		This accrual is calculated using the aggregate cumulative realized capital gains and losses and aggregate cumulative unrealized capital appreciation or depreciation. If such amount is positive at the end of a period, then the Company records a capital gains incentive fee equal to 17.5% of such amount, minus the aggregate amount of actual incentive fees based on capital gains paid in all prior periods. If such amount is negative, then there is no accrual for such period. There can be no assurance that such unrealized capital appreciation will be realized in the future
Capital gains incentive fees on unrealized capital appreciation		$ 0	$ 721,000
Percentage of outstanding common stock owned		2.58%		3.10%
Capital gains incentive fees remain outstanding		$ 0		$ 0
Minimum | Non-controlled Affiliated Investments
Related Party Transaction [Line Items]
Percentage of outstanding voting securities owned		5.00%
Minimum | Controlled Investments
Related Party Transaction [Line Items]
Percentage of outstanding voting securities owned		25.00%
Sun Life Financial Inc
Related Party Transaction [Line Items]
Percentage of outstanding common stock owned		2.91%		3.49%
Sun Life Financial Inc | 2026 Unsecured Notes
Related Party Transaction [Line Items]
Participating lender amount		$ 10,000,000
FCRD Acquisition
Related Party Transaction [Line Items]
Cash consideration	$ 35,000,000