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Portfolio Company Investments - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2025 USD ($) Investment	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($) Investment
Schedule of Investments [Line Items]
Number of investment portfolio companies | Investment	92		87
Number of residual investment porfolio companies | Investment	4		4
Aggregate fair value of total portfolio	$ 1,154,408,000		$ 1,090,506,000
Weighted average yield investment percentage	13.20%		13.30%
Average fully diluted equity ownership percentage	1.90%		2.00%
Percentage of equity investments held in portfolio companies	85.40%		85.70%
Purchases of debt and equity investments	$ 115,555,000	$ 145,861,000
Proceeds from sales and repayments	$ 57,343,000	$ 60,247,000
Number of investments represented more than ten percentage of aggregate investment portfolio | Investment	0		0
Investment	$ 0		$ 0
Investments as percentage of total assets	5.00%		5.00%
Investment, Type [Extensible Enumeration]	Pfanstiehl, Inc		Pfanstiehl, Inc
Maximum
Schedule of Investments [Line Items]
Investment maturity period	7 years
Minimum
Schedule of Investments [Line Items]
Investment maturity period	5 years

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