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Document and Entity Information
Jun. 21, 2021
Cover [Abstract]  
Document Type 8-K
Document Period End Date Jun. 21, 2021
Entity Registrant Name GENCOR INDUSTRIES, INC.
Entity Address, Address Line One 5201 North Orange Blossom Trail
Entity Address, City or Town Orlando
Entity Address, State or Province FL
Entity Address, Postal Zip Code 32810
City Area Code 407
Local Phone Number 290-6000
Entity Incorporation, State or Country Code DE
Entity File Number 001-11703
Entity Tax Identification Number 59-0933147
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock
Trading Symbol GENC
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0000064472