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Document and Entity Information	9 Months Ended
	Jun. 30, 2012	Aug. 03, 2012 Common Stock	Aug. 03, 2012 Class B Stock
Entity Registrant Name	GENCOR INDUSTRIES INC
Entity Central Index Key	0000064472
Document Type	10-Q
Document Period End Date	Jun. 30, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--09-30
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		8,008,632	1,509,238

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