Document and Entity Information - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2026 |
Aug. 20, 2026 |
Dec. 31, 2025 |
|
| Document Information [Line Items] | |||
| Document Type | 10-K | ||
| Amendment Flag | false | ||
| Document Period End Date | Jun. 30, 2026 | ||
| Document Fiscal Year Focus | 2026 | ||
| Document Fiscal Period Focus | FY | ||
| Entity Registrant Name | GREAT ELM GROUP, INC. | ||
| Entity Central Index Key | 0001831096 | ||
| Current Fiscal Year End Date | --06-30 | ||
| Entity Well-known Seasoned Issuer | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Filer Category | Non-accelerated Filer | ||
| Entity Common Stock, Shares Outstanding | 31,094,890 | ||
| Entity Public Float | $ 30,268,395 | ||
| Entity Small Business | true | ||
| Entity Emerging Growth Company | false | ||
| Document Financial Statement Error Correction [Flag] | false | ||
| Entity Shell Company | false | ||
| Entity File Number | 001-39832 | ||
| Entity Tax Identification Number | 85-3622015 | ||
| Entity Address, Address Line One | 3801 PGA Boulevard | ||
| Entity Address, Address Line Two | Suite 603 | ||
| Entity Address, City or Town | Palm Beach Gardens | ||
| Entity Address, State or Province | FL | ||
| Entity Address, Postal Zip Code | 33410 | ||
| City Area Code | 617 | ||
| Local Phone Number | 375-3006 | ||
| Document Annual Report | true | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Interactive Data Current | Yes | ||
| Document Transition Report | false | ||
| ICFR Auditor Attestation Flag | false | ||
| Auditor Name | Deloitte & Touche LLP | ||
| Auditor Firm ID | 34 | ||
| Auditor Location | Boston, Massachusetts | ||
| Auditor Opinion [Text Block] | Opinion on the Financial Statements We have audited the accompanying consolidated balance sheets of Great Elm Group, Inc. and subsidiaries (the "Company") as of June 30, 2026 and 2025, the related consolidated statements of operations, stockholders’ equity, and cash flows, for the years ended June 30, 2026 and 2025, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of June 30, 2026 and 2025, and the results of its operations and its cash flows for the years ended June 30, 2026 and 2025, in conformity with accounting principles generally accepted in the United States of America. |
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| Documents Incorporated by Reference | Portions of the definitive proxy statement for the annual meeting of stockholders of the Registrant, to be filed with the Securities and Exchange Commission within 120 days of our fiscal year ended June 30, 2026, are incorporated by reference into Part III of this report. |
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| Common Stock | |||
| Document Information [Line Items] | |||
| Title of each class | Common stock, par value $0.001 per share | ||
| Trading Symbol | GEG | ||
| Security Exchange Name | NASDAQ | ||
| 7.25% Notes due 2027 | |||
| Document Information [Line Items] | |||
| Title of each class | 7.25% Notes due 2027 | ||
| Trading Symbol | GEGGL | ||
| Security Exchange Name | NASDAQ |