Significant Agreements and Related Parties - Additional Information (Details) - USD ($)		9 Months Ended	12 Months Ended
	Apr. 01, 2022	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2022
Related Party Transaction [Line Items]
Capital gains incentive fees eliminated	$ 163,200,000
Management fee calculated at annual rate of average adjusted gross assets			1.50%
Management fees			$ 3,205,000	$ 3,182,000	$ 2,511,000
Management fee payable		$ 850,000	$ 850,000	881,000
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		$ 565,000	$ 565,000	4,854,000
Incentive fee waiver			(4,854,000)
Administration fees			938,000	673,000	729,000
Great Elm Capital Management, Inc.,
Related Party Transaction [Line Items]
Aggregate cumulative realized capital gains percentage		20.00%
Accrued incentive fees payable		$ 565,000	565,000	4,854,000		$ 4,900,000
Incentive fee waiver			565,000	(4,323,000)	1,020,000
Capital gains incentive fees accrual			0	0	0
Administration fees			938,000	673,000	$ 729,000
Administrative expense payable		$ 188,000	$ 188,000	131,000
Avanti Communications Group PLC
Related Party Transaction [Line Items]
Accrued incentive fees payable				$ 5,014,000
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%