Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2023

Significant Accounting Policies

Schedule of Investments Measured at Fair Value

			Fair Value Measurements as of June 30, 2023
(in thousands)	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Investments:
Control investments	$	23,200	$	—	$	—	$	23,200
Total investments		23,200		—		—		23,200
Temporary cash investments		12,989		12,989		—		—
Total investments and temporary cash investments	$	36,189	$	12,989	$	—	$	23,200

			Fair Value Measurements as of December 31, 2022
(in thousands)	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Investments:
Control investments	$	15,650	$	—	$	—	$	15,650
Total investments		15,650		—		—		15,650
Temporary cash investments		5,998		5,998		—		—
Total investments and temporary cash investments	$	21,648	$	5,998	$	—	$	15,650

Schedule of Reconciliation of Fair Value Changes for Investments

	Fair value measurements using significant unobservable inputs (Level 3)
(in thousands)	Control Investments		Affiliate Investments		Non-affiliate Investments		Total
Fair value as of January 1, 2023	$	15,650	$	—	$	—	$	15,650
Change in unrealized appreciation		6,800		—		—		6,800
Purchases of portfolio securities		750		—		—		750
Fair value as of June 30, 2023	$	23,200	$	—	$	—	$	23,200

	Fair value measurements using significant unobservable inputs (Level 3)
(in thousands)	Control Investments		Affiliate Investments		Non-affiliate Investments		Total
Fair value as of January 1, 2022	$	13,000	$	—	$	—	$	13,000
Change in unrealized appreciation		2,500		—		—		2,500
Fair value as of June 30, 2022	$	15,500	$	—	$	—	$	15,500

Schedule of Fair Value Measurement Significant Non-Observable Inputs

				Range
(in thousands)	Fair Value	Valuation Techniques	Unobservable Inputs	Minimum	Maximum	Weighted Average
Limited liability company investments
			Acreage Value (per acre)	$1,500	$11,000	$4,062
Equus Energy, LLC	$ 15,650	Guideline Transaction Method	Proved Reserve Multiple	4.5x	11.9x	10.2x
			Daily Production Multiple	18,578.7x	50,861.2x	45,069.6x
			Discount Rate	11.3%	11.3%	11.3%
			Proved Reserve Multiple	9,198x	11,337x	10,267.5x
		Guideline Public Company Method	Daily Production Multiple	34,150x	53,622x	43,886x
Morgan E&P, LLC	6,800		Proved Reserve Multiple	8,878x	12,716x	10,797x
		Guideline Transaction Method	Daily Production Multiple	36,221x	60,083x	48,152x
		Discounted Cash Flow	Discount Rate	10.7%	12.3%	11.3%
Senior debt
Morgan E&P, LLC	750	Yield analysis	Discount for lack of marketability	12.0%	12.1%	12.05%
	$ 23,200

				Range
(in thousands)	Fair Value	Valuation Techniques	Unobservable Inputs	Minimum	Maximum	Weighted Average
Limited liability company investments
			Acreage Value (per acre)	$1,500	$11,000	$4,062
Equus Energy, LLC	$15,650	Guideline Transaction Method	Proved Reserve Multiple	4.0x	9.5x	8.2x
			Daily Production Multiple	18,578.7x	47,513.7x	40,284.4x
		Discounted Cash Flow	Discount Rate	11.0%	11.0%	11.0%

Schedule of Distributable Earnings

	June 30, 2023			December 31, 2022
Accumulated undistributed net investment losses	$	(49,428	)	$	(47,430	)
Unrealized appreciation of portfolio securities, net		14,339			7,539
Accumulated undistributed net capital gains		442			430
Accumulated deficit	$	(34,647	)	$	(39,461	)

Schedule of Cash and Cash Equivalents

	June 30, 2023		December 31, 2022
Cash and cash equivalents at end of period	$	16,407	$	19,224
Restricted cash at end of period		130		60
Cash and cash equivalents and restricted cash at end of period	$	16,537	$	19,284