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Organization	9 Months Ended
	Sep. 30, 2025
Accounting Policies [Abstract]
Organization	1. ORGANIZATION Great Elm Capital Corp. (the “Company”) was formed on April 22, 2016 as a Maryland corporation. The Company is structured as an externally managed, non-diversified closed-end management investment company. The Company elected to be regulated as a business development company (a “BDC”) under the Investment Company Act of 1940, as amended (the “Investment Company Act”). The Company is managed by Great Elm Capital Management, LLC, a Delaware corporation (“GECM”), a subsidiary of Great Elm Group, Inc., a Delaware corporation (“GEG”). The Company seeks to generate current income and capital appreciation through debt and income-generating equity investments, including investments in specialty finance businesses.

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The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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