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Document And Entity Information
 3 Months Ended
Dec. 31, 2011
Feb. 10, 2012
Common Stock [Member]
Feb. 10, 2012
Class B Stock [Member]
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Dec. 31, 2011    
Document Fiscal Period Focus Q1    
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