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Cover
Apr. 22, 2025
Document Type 8-K
Amendment Flag false
Document Period End Date Apr. 22, 2025
Entity File Number 811-08476
Entity Registrant Name Gabelli Multimedia Trust Inc.
Entity Central Index Key 0000921671
Entity Tax Identification Number 13-3767317
Entity Incorporation, State or Country Code MD
Entity Address, Address Line One One Corporate Center
Entity Address, City or Town Rye
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10580
City Area Code 800
Local Phone Number 422-3554
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Title of 12(b) Security Common Stock
Trading Symbol GGT
Security Exchange Name NYSE
5.125% Series G Cumulative Preferred Stock  
Title of 12(b) Security 5.125% Series G Cumulative Preferred Stock
Trading Symbol GGTPrG
Security Exchange Name NYSE
5.125% Series E Cumulative Preferred Stock  
Title of 12(b) Security 5.125% Series E Cumulative Preferred Stock
Trading Symbol GGTPrE
Security Exchange Name NYSE