Significant Agreements and Related Parties - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended	83 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Sep. 30, 2023	Mar. 31, 2022
Related Party Transaction [Line Items]
Management fee calculated at annual rate of average adjusted gross assets			1.50%
Management fees	$ 899,000	$ 804,000	$ 2,652,000	$ 2,355,000
Management fee payable	899,000		$ 899,000		$ 850,000	$ 899,000
Income incentive fee calculation percentage on pre-incentive fee net investment income			20.00%
Hurdle rate income incentive fee calculation on quarterly basis			1.75%
Annualized hurdle rate on income incentive fee calculation			7.00%
Percentage of net assets			1.75%
Percentage of annualized pre-incentive fee net investment income subject to a catch-up provision			8.75%
Receivable percentage of pre-incentive fee net investment income			20.00%
Percentage of Cumulative pre incentive fee net return			20.00%
Accrued incentive fees payable	1,879,000		$ 1,879,000		565,000	$ 1,879,000
Incentive fees	763,000		2,315,000
Incentive fee waiver				4,854,000
Administration fees	420,000	221,000	1,056,000	704,000
Great Elm Capital Management, Inc.,
Related Party Transaction [Line Items]
Aggregate cumulative realized capital gains percentage						20.00%
Cumulative accrued incentive fees payable	1,879,000		1,879,000			$ 1,879,000
Accrued incentive fees payable	1,300,000		1,300,000		565,000	1,300,000	$ 4,900,000
Incentive fees			2,315,000
Incentive fee waiver				(4,854,000)
Capital gains incentive fees accrual			0		0
Administration fees	420,000	$ 221,000	1,056,000	$ 704,000
Administrative expense payable	$ 307,000		$ 307,000		$ 188,000	$ 307,000
Minimum
Related Party Transaction [Line Items]
Hurdle rate income incentive fee calculation on quarterly basis			1.75%
Maximum
Related Party Transaction [Line Items]
Hurdle rate income incentive fee calculation on quarterly basis			2.1875%
Percentage of net assets			2.1875%