Condensed Consolidated Statements of Stockholders' Equity and Contingently Redeemable Non-controlling Interest (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Total Great Elm Group Inc. Stockholders' Equity	Non-controlling Interest
Beginning balance at Jun. 30, 2022	$ 40,029	$ 29	$ 3,312,763	$ (3,279,296)	$ 33,496	$ 6,533
Beginning balance (in shares) at Jun. 30, 2022		28,507,000
Beginning balance, Contingently redeemable non-controlling interest at Jun. 30, 2022	2,225
Net (loss) income	(9,201)			(8,291)	(8,291)	(910)
Net (loss) income, Contingently redeemable non-controlling interest	662
Distributions to non-controlling interests in Consolidated Funds	(634)					(634)
Issuance of common stock related to vesting of restricted stock (in shares)		267,000
Stock-based compensation	834		834		834
Ending balance at Sep. 30, 2022	31,028	$ 29	3,313,597	(3,287,587)	26,039	4,989
Ending balance (in shares) at Sep. 30, 2022		28,774,000
Ending balance, Contingently redeemable non-controlling interest at Sep. 30, 2022	2,887
Net (loss) income	29,638			29,530	29,530	108
Net (loss) income, Contingently redeemable non-controlling interest	90
Redemption of non-controlling interests upon sale of controlling interest in subsidiary	(2,120)					(2,120)
Issuance of common stock related to vesting of restricted stock (in shares)		202,000
Stock-based compensation	576		576		576
Ending balance at Dec. 31, 2022	59,122	$ 29	3,314,173	(3,258,057)	56,145	2,977
Ending balance (in shares) at Dec. 31, 2022		28,976,000
Ending balance, Contingently redeemable non-controlling interest at Dec. 31, 2022	2,977
Beginning balance at Jun. 30, 2023	$ 63,842	$ 30	3,315,378	(3,251,566)	63,842
Beginning balance (in shares) at Jun. 30, 2023	29,546,655	29,547,000
Net (loss) income	$ 2,774			2,774	2,774
Issuance of common stock related to vesting of restricted stock (in shares)		322,000
Stock-based compensation	705		705		705
Ending balance at Sep. 30, 2023	67,321	$ 30	3,316,083	(3,248,792)	67,321
Ending balance (in shares) at Sep. 30, 2023		29,869,000
Net (loss) income	(239)			(350)	(350)	111
Issuance of interests in Consolidated Funds	6,900					6,900
Issuance of common stock related to vesting of restricted stock (in shares)		181,000
Stock-based compensation	625		625		625
Ending balance at Dec. 31, 2023	$ 74,607	$ 30	$ 3,316,708	$ (3,249,142)	$ 67,596	$ 7,011
Ending balance (in shares) at Dec. 31, 2023	30,050,059	30,050,000