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, 2021	$ 52,785	$ 26	$ 3,307,613	$ (3,264,403)	$ 43,236	$ 9,549
Beginning balance (in shares) at Jun. 30, 2021		25,948,000
Beginning balance, Contingently redeemable non-controlling interest at Jun. 30, 2021	2,639
Net (loss) income	(99)			(200)	(200)	101
Net (loss) income, Contingently redeemable non-controlling interest	205
Issuance of interests in Consolidated Funds, net	527					527
Issuance of common stock related to vesting of restricted stock (in shares)		145,000
Stock-based compensation	581		581		581
Ending balance at Sep. 30, 2021	53,794	$ 26	3,308,194	(3,264,603)	43,617	10,177
Ending balance (in shares) at Sep. 30, 2021		26,093,000
Ending balance, Contingently redeemable non-controlling interest at Sep. 30, 2021	2,844
Net (loss) income	(4,262)			(4,238)	(4,238)	(24)
Net (loss) income, Contingently redeemable non-controlling interest	104
Redemption of interests in Consolidated Funds, net	(962)					(962)
Issuance of common stock related to vesting of restricted stock	1	$ 1			1
Issuance of common stock related to vesting of restricted stock (in shares)		722,000
Stock-based compensation	1,131		1,131		1,131
Ending balance at Dec. 31, 2021	49,702	$ 27	3,309,325	(3,268,841)	40,511	9,191
Ending balance (in shares) at Dec. 31, 2021		26,815,000
Ending balance, Contingently redeemable non-controlling interest at Dec. 31, 2021	2,948
Net (loss) income	(5,449)			(5,909)	(5,909)	460
Net (loss) income, Contingently redeemable non-controlling interest	(686)
Repurchases of Interests in Subsidiary	(43)		(129)		(129)	86
Issuance of common stock related to vesting of restricted stock (in shares)		148,000
Stock-based compensation	508		508		508
Ending balance at Mar. 31, 2022	44,718	$ 27	3,309,704	(3,274,750)	34,981	9,737
Ending balance (in shares) at Mar. 31, 2022		26,963,000
Ending balance, Contingently redeemable non-controlling interest at Mar. 31, 2022	2,262
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	28,507,490	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 Fund	(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
Net (loss) income	11,748			11,748	11,748
Redemption of non-controlling interests upon sale of subsidiaries	(2,977)					$ (2,977)
Redemption of non-controlling interests upon sale of subsidiaries , contingently redeemable non-controlling interest	(2,977)
Issuance of common stock related to vesting of restricted stock (in shares)		170,000
Stock-based compensation	564		564		564
Ending balance at Mar. 31, 2023	$ 68,457	$ 29	$ 3,314,737	$ (3,246,309)	$ 68,457
Ending balance (in shares) at Mar. 31, 2023	29,146,053	29,146,000