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Cover Page - shares
 9 Months Ended
Jun. 30, 2020
Jul. 31, 2020
Document Information [Line Items]    
Document Type 10-Q/A  
Amendment Flag true  
Document Period End Date Jun. 30, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
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 Quarterly Report true  
Document Transition Report false  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Interactive Data Current Yes  
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 NASDAQ  
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  
Amendment Description Gencor Industries, Inc. (the “Company”) is filing this Amendment No. 1 on Form 10-Q/A (the “Form 10-Q/A”) to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2020, filed with the Securities and Exchange Commission on August 6, 2020 (the “Form 10-Q”), solely to correct an error in certain amounts disclosed in Note 2 to the Condensed Consolidated Financial Statements. The Form 10-Q incorrectly stated that the changes in net unrealized gains and (losses) included in the condensed consolidated statements of income for the quarter and nine months ended June 30, 2020, were $(857,000) and $3,979,000, respectively, when it should have stated that the changes in net unrealized gains and (losses) included in the condensed consolidated statements of income for the quarter and nine months ended June 30, 2020, were $3,979,000 and $(857,000), respectively. The Form 10-Q also incorrectly stated that the changes in net unrealized gains and (losses) included in the condensed consolidated statements of income for the quarter and nine months ended June 30, 2019, were $3,979,000 and $(857,000), respectively, when it should have stated that the changes in net unrealized gains and (losses) included in the condensed consolidated statements of income for the quarter and nine months ended June 30, 2019, were $(123,000) and $684,000, respectively. This Form 10-Q/A should be read in conjunction with the Form 10-Q, which, as amended hereby, continues to be as of the date of the Form 10-Q. Except as specifically noted above, this Form 10-Q/A does not amend, restate, modify or update the information in the Form 10-Q. Accordingly, this Form 10-Q/A does not reflect events occurring after the filing of the Form 10-Q or amend, restate, modify or update any related or other disclosures or information contained therein. As required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended, new certifications by the Company’s Chief Executive Officer and Chief Financial Officer are being filed herewith as exhibits to this Form 10-Q/A (Exhibit 31.1, Exhibit 31.2, and Exhibit 32).  
Common Stock [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   12,287,337
Class B Stock [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   2,318,857