Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) Equipment Loan	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) Loan Equipment	Dec. 31, 2022 USD ($)
Disclosure Of Summary Of Significant Accounting Policies [Line Items]
Fair value of companies investment percentage	99.20%		99.20%
Market index of investment securities			$ 0
Maturity period description			original maturity of three months or less
Cash and cash equivalents	$ 8,535,000		$ 8,535,000		$ 4,761,000
Total cash, cash equivalents and restricted cash shown in the Consolidated Statements of Cash Flows	8,535,000	$ 7,230,000	8,535,000	$ 7,230,000	4,761,000	$ 10,612,000
Restricted cash	0		$ 0		0
Escrow Distribution period			1 year
Escrow receivables balance			$ 0		$ 2,400,000
Interest income	1,600,000	2,100,000	7,400,000	5,400,000
Dividend income	500,000	$ 100,000	$ 1,000,000	$ 100,000
Debt security payment due			90 days
Number of portfolio companies loans | Loan			3		3
Number of portfolio companies equipment financing | Equipment			2		2
Non accrual cost			$ 47,200,000		$ 60,800,000
Fair value	$ 22,200,000		$ 22,200,000		$ 43,200,000
Fair value of debt investment portfolio			1.40%		3.50%
Debt instrument percentage	6.00%		6.00%
Investment percentage			16.30%	17.70%
Percentage of net tax- exempt income			90.00%
Uncertain tax position			$ 0		$ 0
Nondeductible federal excise tax			4.00%
Ordinary income percentage			98.00%
Capital gain net income percentage			98.20%
Excise tax			4.00%
Goldman Sachs Financial Square Government Institutional Fund
Disclosure Of Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 900,000		$ 900,000		$ 3,100,000
Minimum
Disclosure Of Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents interest rate			3.00%
Investment percentage			90.00%
Maximum
Disclosure Of Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents interest rate			6.00%