Investments - Quantitative Information About Level 3 Fair Value Measurements (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($) Y	Dec. 31, 2023 USD ($) Y
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	$ 415,880	$ 359,122
Minimum
Investments
Valuation technique receiving a relative weight (as a percent)	0.00%
Maximum
Investments
Valuation technique receiving a relative weight (as a percent)	100.00%
Corporate Bond
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	$ 82,539	92,736
First Lien Secured Debt
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	322,967	254,954
Second lien secured debt
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	4,460	2,012
Equity - Preferred Equity
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	3,151	3,151
Equity - Common Stock
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	2,377	267
Level 3
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	195,175	152,409
Level 3 | Corporate Bond
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	28,184	28,147
Level 3 | Corporate Bond | Environmental Industries
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	13,348	13,447
Level 3 | Corporate Bond | Software
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	$ 14,836	$ 14,700
Level 3 | Corporate Bond | Yield analysis | Market yield | Minimum | Environmental Industries
Investments
Measurement inputs	0.1016	0.1308
Level 3 | Corporate Bond | Yield analysis | Market yield | Minimum | Software
Investments
Measurement inputs	0.1252	0.1160
Level 3 | Corporate Bond | Yield analysis | Market yield | Maximum | Environmental Industries
Investments
Measurement inputs	0.1016	0.1308
Level 3 | Corporate Bond | Yield analysis | Market yield | Maximum | Software
Investments
Measurement inputs	0.1439	0.1260
Level 3 | Corporate Bond | Yield analysis | Market yield | Weighted Average | Environmental Industries
Investments
Measurement inputs	0.1016	0.1308
Level 3 | Corporate Bond | Yield analysis | Market yield | Weighted Average | Software
Investments
Measurement inputs	0.1346	0.1210
Level 3 | Corporate Bond | EV market multiple analysis | EBITDA multiple | Minimum | Software
Investments
Measurement inputs	0.1150
Level 3 | Corporate Bond | EV market multiple analysis | EBITDA multiple | Maximum | Software
Investments
Measurement inputs	0.1250
Level 3 | Corporate Bond | EV market multiple analysis | EBITDA multiple | Weighted Average | Software
Investments
Measurement inputs	0.1200
Level 3 | Corporate Bond | Black Scholes Option Pricing Model | Volatility | Minimum | Environmental Industries
Investments
Measurement inputs	0.1000	0.1000
Level 3 | Corporate Bond | Black Scholes Option Pricing Model | Volatility | Maximum | Environmental Industries
Investments
Measurement inputs	0.4150	0.4750
Level 3 | Corporate Bond | Black Scholes Option Pricing Model | Volatility | Weighted Average | Environmental Industries
Investments
Measurement inputs	0.2575	0.2875
Level 3 | Corporate Bond | Black Scholes Option Pricing Model | Term | Minimum | Environmental Industries
Investments
Measurement inputs | Y	1.84	2.60
Level 3 | Corporate Bond | Black Scholes Option Pricing Model | Term | Maximum | Environmental Industries
Investments
Measurement inputs | Y	1.84	2.60
Level 3 | Corporate Bond | Black Scholes Option Pricing Model | Term | Weighted Average | Environmental Industries
Investments
Measurement inputs | Y	1.84	2.60
Level 3 | Corporate Bond | Black Scholes Option Pricing Model | Risk Free Rate | Minimum | Environmental Industries
Investments
Measurement inputs	0.0344	0.0410
Level 3 | Corporate Bond | Black Scholes Option Pricing Model | Risk Free Rate | Maximum | Environmental Industries
Investments
Measurement inputs	0.0344	0.0410
Level 3 | Corporate Bond | Black Scholes Option Pricing Model | Risk Free Rate | Weighted Average | Environmental Industries
Investments
Measurement inputs	0.0344	0.0410
Level 3 | First Lien Secured Debt
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	$ 158,773	$ 118,248
Level 3 | First Lien Secured Debt One
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	$ 40,260	$ 38,162
Level 3 | First Lien Secured Debt One | Yield analysis | Market yield | Minimum
Investments
Measurement inputs	0.0945	0.0986
Level 3 | First Lien Secured Debt One | Yield analysis | Market yield | Maximum
Investments
Measurement inputs	0.1105	0.1191
Level 3 | First Lien Secured Debt One | Yield analysis | Market yield | Weighted Average
Investments
Measurement inputs	0.1028	0.1081
Level 3 | First Lien Secured Debt One | EV market multiple analysis | EBITDA multiple | Minimum
Investments
Measurement inputs		0.1150
Level 3 | First Lien Secured Debt One | EV market multiple analysis | EBITDA multiple | Maximum
Investments
Measurement inputs		0.1325
Level 3 | First Lien Secured Debt One | EV market multiple analysis | EBITDA multiple | Weighted Average
Investments
Measurement inputs		0.1247
Level 3 | First Lien Secured Debt Two
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	$ 18,581	$ 29,931
Level 3 | First Lien Secured Debt Two | Yield analysis | Market yield | Minimum
Investments
Measurement inputs	0.1052	0.0944
Level 3 | First Lien Secured Debt Two | Yield analysis | Market yield | Maximum
Investments
Measurement inputs	0.1094	0.1224
Level 3 | First Lien Secured Debt Two | Yield analysis | Market yield | Weighted Average
Investments
Measurement inputs	0.1073	0.1057
Level 3 | First Lien Secured Debt Two | EV market multiple analysis | EBITDA multiple | Minimum
Investments
Measurement inputs	7.00
Level 3 | First Lien Secured Debt Two | EV market multiple analysis | EBITDA multiple | Maximum
Investments
Measurement inputs	8.00
Level 3 | First Lien Secured Debt Two | EV market multiple analysis | EBITDA multiple | Weighted Average
Investments
Measurement inputs	7.50
Level 3 | First Lien Secured Debt Three
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	$ 62,036	$ 14,523
Level 3 | First Lien Secured Debt Four
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	37,896	35,632
Level 3 | Second lien secured debt
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	$ 2,304	$ 2,012
Level 3 | Second lien secured debt | EV market multiple analysis | EBITDA multiple | Minimum
Investments
Measurement inputs	9.79
Level 3 | Second lien secured debt | EV market multiple analysis | EBITDA multiple | Maximum
Investments
Measurement inputs	15.39
Level 3 | Second lien secured debt | EV market multiple analysis | EBITDA multiple | Weighted Average
Investments
Measurement inputs	12.59
Level 3 | Second lien secured debt | Discounted cash flow analysis | Discount rate | Minimum
Investments
Measurement inputs	0.3325	0.3325
Level 3 | Second lien secured debt | Discounted cash flow analysis | Discount rate | Maximum
Investments
Measurement inputs	0.3525	0.3525
Level 3 | Second lien secured debt | Discounted cash flow analysis | Discount rate | Weighted Average
Investments
Measurement inputs	0.3425	0.3425
Level 3 | Second lien secured debt | Discounted cash flow analysis | Revenue growth rate | Minimum
Investments
Measurement inputs	0.0325	0.0325
Level 3 | Second lien secured debt | Discounted cash flow analysis | Revenue growth rate | Maximum
Investments
Measurement inputs	0.0425	0.0425
Level 3 | Second lien secured debt | Discounted cash flow analysis | Revenue growth rate | Weighted Average
Investments
Measurement inputs	0.0375	0.0375
Level 3 | Second lien secured debt | Discounted cash flow analysis | Revenue multiple | Minimum
Investments
Measurement inputs		0.0038
Level 3 | Second lien secured debt | Discounted cash flow analysis | Revenue multiple | Maximum
Investments
Measurement inputs		0.0045
Level 3 | Second lien secured debt | Discounted cash flow analysis | Revenue multiple | Weighted Average
Investments
Measurement inputs		0.0041
Level 3 | Revolver
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	$ 386
Level 3 | Revolver One
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)		$ (4)
Level 3 | Revolver One | Yield analysis | Market yield | Minimum
Investments
Measurement inputs		0.0986
Level 3 | Revolver One | Yield analysis | Market yield | Maximum
Investments
Measurement inputs		0.1191
Level 3 | Revolver One | Yield analysis | Market yield | Weighted Average
Investments
Measurement inputs		0.1138
Level 3 | Revolver One | EV market multiple analysis | EBITDA multiple | Minimum
Investments
Measurement inputs		0.1200
Level 3 | Revolver One | EV market multiple analysis | EBITDA multiple | Maximum
Investments
Measurement inputs		0.1325
Level 3 | Revolver One | EV market multiple analysis | EBITDA multiple | Weighted Average
Investments
Measurement inputs		0.1275
Level 3 | Revolver Two
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)		$ 588
Level 3 | Revolver Two | Yield analysis | Market yield | Minimum
Investments
Measurement inputs		0.1124
Level 3 | Revolver Two | Yield analysis | Market yield | Maximum
Investments
Measurement inputs		0.1224
Level 3 | Revolver Two | Yield analysis | Market yield | Weighted Average
Investments
Measurement inputs		0.1174
Level 3 | Equity - Preferred Equity
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	$ 3,151	$ 3,151
Level 3 | Equity - Preferred Equity | EV market multiple analysis | EBITDA multiple | Minimum
Investments
Measurement inputs	0.0979
Level 3 | Equity - Preferred Equity | EV market multiple analysis | EBITDA multiple | Maximum
Investments
Measurement inputs	0.1539
Level 3 | Equity - Preferred Equity | EV market multiple analysis | EBITDA multiple | Weighted Average
Investments
Measurement inputs	0.1259
Level 3 | Equity - Preferred Equity | Discounted cash flow analysis | Discount rate | Minimum
Investments
Measurement inputs	0.3325	0.3325
Level 3 | Equity - Preferred Equity | Discounted cash flow analysis | Discount rate | Maximum
Investments
Measurement inputs	0.3525	0.3525
Level 3 | Equity - Preferred Equity | Discounted cash flow analysis | Discount rate | Weighted Average
Investments
Measurement inputs	0.3425	0.3425
Level 3 | Equity - Preferred Equity | Discounted cash flow analysis | Revenue growth rate | Minimum
Investments
Measurement inputs	0.0325	0.0325
Level 3 | Equity - Preferred Equity | Discounted cash flow analysis | Revenue growth rate | Maximum
Investments
Measurement inputs	0.0425	0.0425
Level 3 | Equity - Preferred Equity | Discounted cash flow analysis | Revenue growth rate | Weighted Average
Investments
Measurement inputs	0.0375	0.0375
Level 3 | Equity - Preferred Equity | Discounted cash flow analysis | Revenue multiple | Minimum
Investments
Measurement inputs		0.0038
Level 3 | Equity - Preferred Equity | Discounted cash flow analysis | Revenue multiple | Maximum
Investments
Measurement inputs		0.0045
Level 3 | Equity - Preferred Equity | Discounted cash flow analysis | Revenue multiple | Weighted Average
Investments
Measurement inputs		0.0041
Level 3 | Equity - Common Stock
Investments
Total Investments (Non-controlled/Non-affiliated/Affiliated)	$ 2,377	$ 267
Level 3 | Equity - Common Stock | EV market multiple analysis | EBITDA multiple | Minimum
Investments
Measurement inputs	0.0979
Level 3 | Equity - Common Stock | EV market multiple analysis | EBITDA multiple | Maximum
Investments
Measurement inputs	0.1539
Level 3 | Equity - Common Stock | EV market multiple analysis | EBITDA multiple | Weighted Average
Investments
Measurement inputs	0.1259
Level 3 | Equity - Common Stock | Discounted cash flow analysis | Discount rate | Minimum
Investments
Measurement inputs	0.3325	0.3325
Level 3 | Equity - Common Stock | Discounted cash flow analysis | Discount rate | Maximum
Investments
Measurement inputs	0.3525	0.3525
Level 3 | Equity - Common Stock | Discounted cash flow analysis | Discount rate | Weighted Average
Investments
Measurement inputs	0.3425	0.3425
Level 3 | Equity - Common Stock | Discounted cash flow analysis | Revenue growth rate | Minimum
Investments
Measurement inputs	0.0325	0.0325
Level 3 | Equity - Common Stock | Discounted cash flow analysis | Revenue growth rate | Maximum
Investments
Measurement inputs	0.0425	0.0425
Level 3 | Equity - Common Stock | Discounted cash flow analysis | Revenue growth rate | Weighted Average
Investments
Measurement inputs	0.0375	0.0375
Level 3 | Equity - Common Stock | Discounted cash flow analysis | Revenue multiple | Minimum
Investments
Measurement inputs		0.0038
Level 3 | Equity - Common Stock | Discounted cash flow analysis | Revenue multiple | Maximum
Investments
Measurement inputs		0.0045
Level 3 | Equity - Common Stock | Discounted cash flow analysis | Revenue multiple | Weighted Average
Investments
Measurement inputs		0.0041