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Document and Entity Information (USD $)
 12 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Dec. 02, 2013
Common Stock [Member]
Dec. 02, 2013
Class B Stock [Member]
Document Information [Line Items]        
Document Type 10-K      
Amendment Flag false      
Document Period End Date Sep. 30, 2013      
Document Fiscal Year Focus 2013      
Document Fiscal Period Focus FY      
Entity Registrant Name GENCOR INDUSTRIES INC      
Entity Central Index Key 0000064472      
Current Fiscal Year End Date --09-30      
Entity Well-known Seasoned Issuer No      
Entity Current Reporting Status Yes      
Entity Voluntary Filers No      
Entity Filer Category Smaller Reporting Company      
Entity Common Stock, Shares Outstanding     8,008,632 1,509,238
Entity Public Float   $ 48,016,400