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Summary of Significant Accounting Policies - Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]        
Net loss $ (946) $ (2,027) $ (4,809) $ (5,305)
Less: net loss attributable to non-controlling interest (597) (186) (704) (375)
Net loss attributable to Great Elm Group, Inc. $ (349) $ (1,841) $ (4,105) $ (4,930)
Net loss attributable to shareholders per share        
Basic $ (0.01) $ (0.07) $ (0.16) $ (0.19)
Diluted $ (0.01) $ (0.07) $ (0.16) $ (0.19)
Weighted average shares outstanding        
Basic 25,678 25,402 25,626 25,387
Diluted 25,678 25,402 25,626 25,387