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Cover Page - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Jun. 25, 2025
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag true    
Document Period End Date Sep. 30, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Registrant Name GENCOR INDUSTRIES, INC.    
Entity File Number 001-11703    
Entity Tax Identification Number 59-0933147    
Trading Symbol GENC    
Entity Central Index Key 0000064472    
Current Fiscal Year End Date --09-30    
Document Annual Report true    
Document Transition Report false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Interactive Data Current No    
City Area Code 407    
Local Phone Number 290-6000    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Address, Address Line One 5201 North Orange Blossom Trail    
Entity Shell Company false    
Title of 12(b) Security Common Stock    
Security Exchange Name NYSEAMER    
Entity Address, State or Province FL    
Entity Address, City or Town Orlando    
Entity Address, Postal Zip Code 32810    
Entity Incorporation, State or Country Code DE    
Entity Public Float $ 160,204,000    
ICFR Auditor Attestation Flag true    
Auditor Name Berkowitz Pollack Brant Advisors + CPAs MSL, P.A.  
Auditor Firm ID 52 569  
Auditor Location West Palm Beach, Florida Orlando, Florida  
Document Financial Statement Error Correction [Flag] false    
Amendment Description EXPLANATORY NOTE On November 1, 2024, we were notified that MSL, P.A. (“MSL”), our previous independent registered public accounting firm, entered into a transaction with Forvis Mazars, LLP (“Forvis Mazars”), whereby substantially all of the partners and employees of MSL joined Forvis Mazars. As a result, on the effective date of November 1, 2024, our Audit Committee dismissed MSL and appointed Forvis Mazars to serve as our independent registered public accounting firm. The change in our independent registered public accounting firm subsequent to our year-end resulted in the need for additional time for us to coordinate the completion of the audit of the financial statements for the year ended September 30, 2024 and the audit of internal control over financial reporting as of September 30, 2024 (the “2024 Audit”). Due to the delay in the completion of the 2024 Audit we determined that we were unable to file our Annual Report on Form 10-K for the fiscal year ended September 30, 2024 (the “2024 Annual Report”) within the time period prescribed. Additionally, we dismissed Forvis Mazars as our independent registered public accounting firm on February 13, 2025 and engaged Berkowitz Pollack Brant Advisors + CPAs (“BPB”) as our new independent registered public accounting firm on February 20, 2025. The engagement of BPB resulted in the need for additional time for the Company to coordinate the completion of the 2024 Audit, the 2024 Annual Report and the Quarterly Reports on Form 10-Q for the quarterly periods ended December 31, 2024 and March 31, 2025. Due to the delays discussed above, we were unable to timely file our 2024 Annual Report and Quarterly Reports on Form 10-Q for the quarterly periods ended December 31, 2024 and March 31, 2025, as required under the NYSE American LLC (“NYSE American”) continued listing standards. NYSE Regulation (“NYSE”) informed us that, under the rules of the NYSE American, we have an initial six-month period from the 2024 Annual Report filing due date of December 31, 2024, to regain compliance with the NYSE American continued listing standards by filing all delinquent reports with the SEC, allowing us to file the delinquent reports, including this 2024 Annual Report, by June 30, 2025. On June 10, 2025, we submitted an extension request to the NYSE, requesting additional time to regain compliance with the NYSE American continued listing standards. While we are filing this 2024 Annual Report within the initial six-month period granted by the initial delinquency notice, we requested the extension to allow the Company additional time to coordinate the completion of the Quarterly Reports on Form 10-Q for the quarterly periods ended December 31, 2024 and March 31, 2025. On June 24, 2025, the NYSE informed us that it accepted our extension request, allowing us to submit our delinquent reports by August 19, 2025.    
Common Stock [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding     12,338,845
Class B Stock [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding     2,318,857