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Document And Entity Information
Jun. 08, 2026
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 08, 2026
Entity Registrant Name Great Elm Capital Corp.
Entity Central Index Key 0001675033
Entity Emerging Growth Company false
Entity File Number 814-01211
Entity Incorporation, State or Country Code MD
Entity Tax Identification Number 81-2621577
Entity Address, Address Line One 3801 PGA Boulevard, 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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Common Stock Par Value 0.01 Per Share [Member]  
Document Information [Line Items]  
Title of 12(b) Security Common stock, par value $0.01 per share
Trading Symbol GECC
Security Exchange Name NASDAQ
8.50 Notes Due 2029 [Member]  
Document Information [Line Items]  
Title of 12(b) Security 8.50% Notes due 2029
Trading Symbol GECCI
Security Exchange Name NASDAQ
7.75 Notes Due 2030 [Member]  
Document Information [Line Items]  
Title of 12(b) Security 7.75% Notes due 2030
Trading Symbol GECCG
Security Exchange Name NASDAQ
8.125 Note Due 2029 [Member]  
Document Information [Line Items]  
Title of 12(b) Security 8.125% Notes due 2029
Trading Symbol GECCH
Security Exchange Name NASDAQ