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Document and Entity Information
 6 Months Ended
Mar. 31, 2014
May 09, 2014
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2014  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q2  
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
Class B Stock [Member]
    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   1,509,238