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XML - IDEA: XBRL DOCUMENT - GENCOR INDUSTRIES INCR36.htm
EXCEL - IDEA: XBRL DOCUMENT - GENCOR INDUSTRIES INCFinancial_Report.xls
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10-K - FORM 10-K - GENCOR INDUSTRIES INCd402869d10k.htm
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EX-32.1 - CERTIFICATION - GENCOR INDUSTRIES INCd402869dex321.htm
EX-21.1 - SUBSIDIARIES - GENCOR INDUSTRIES INCd402869dex211.htm
EX-31.1 - CERTIFICATION - GENCOR INDUSTRIES INCd402869dex311.htm
EX-23.1 - CONSENT - GENCOR INDUSTRIES INCd402869dex231.htm
EX-31.2 - CERTIFICATION - GENCOR INDUSTRIES INCd402869dex312.htm
v2.4.0.6
Nature of Operations and Summary of Significant Accounting Policies (Details Textual) (USD $)
Share data in Thousands, unless otherwise specified
12 Months Ended 3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
UNITED STATES
Sep. 30, 2011
UNITED STATES
Nature of Operations and Summary of Significant Accounting Policies (Textual) [Abstract]        
Percentage of net revenue from one or more separate U.S corporate entities on quarterly basis     21.00% 7.00%
Nature of Operations and Summary of Significant Accounting Policies (Additional Textual) [Abstract]        
Common stock equivalents included in Diluted earnings per share 0 0    
Cash equivalents consist of short-term certificates of deposit maturities period 3 months      
Net unrealized gains/losses $ 807,000 $ 3,789,000    
Estimated interest accrued 545,000 568,000    
Percentage of Reduction in Cost basis of inventories due to obsolescence in case inventories three to four years old 50.00%      
Percentage of Reduction in Cost basis of inventories due to obsolescence in case inventories four to five years old 75.00%      
Inventory, time period on the shelf, years 4 years      
Minimum period of inventories remain old to become eligible for reduction in cost basis under condition one 3 years      
Maximum period of inventories remain old to become eligible for reduction in cost basis under condition two 5 years      
Minimum period of inventories remain old to become eligible for reduction in cost basis up to a specific percentage under condition one 4 years      
Maximum period of inventories remain old to become eligible for reduction in cost basis up to a specific percentage under condition two 5 years      
Inventory valuation estimate $ 0      
Time for the collection of cost associated with Pre- contract 1 year      
Percentage of net revenue from one or more separate U.S corporate entities on yearly basis 26.00% 7.00%