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Document And Entity Information
 6 Months Ended
Mar. 31, 2012
May 11, 2012
Common Stock [Member]
May 11, 2012
Class B Stock [Member]
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Mar. 31, 2012    
Document Fiscal Period Focus Q2    
Document Fiscal Year Focus 2012    
Entity Registrant Name GENCOR INDUSTRIES INC    
Entity Central Index Key 0000064472    
Current Fiscal Year End Date --09-30    
Entity Filer Category Smaller Reporting Company    
Entity Common Stock, Shares Outstanding   8,008,632 1,509,238