Non-Controlling Interests and Preferred Stock of Subsidiary - Summary of Non-controlling Interests Balance on Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Net income (loss)
Total	$ (144)	$ (595)
DME, Inc.
Net income (loss)
Temporary equity		(263)
Permanent equity		(263)
Total		(526)
Great Elm Healthcare, LLC (HC LLC)
Net income (loss)
Temporary equity	(414)
Permanent equity	(414)
Total	(828)
GP Corp.
Net income (loss)
Permanent equity		(87)
GEC GP
Net income (loss)
Permanent equity	(6)	(1)
Consolidated Fund
Net income (loss)
Permanent equity	(215)	(96)
Forest
Net income (loss)
Permanent equity	$ 905	62
FM Holdings
Net income (loss)
Permanent equity		$ 53