2.4.0.82104100 - Disclosure - Risks and Uncertaintiestruefalsefalse1false falsefalseD2013Q3YTDhttp://www.sec.gov/CIK0001181749duration2012-11-01T00:00:002013-07-31T00:00:001true 1gfe_RisksandIncertaintiesAbstractgfe_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Risks and Incertainties [Abstract]2false 2gfe_RisksAndUncertaintiesTextBlockgfe_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">RISKS AND UNCERTAINTIES </font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company has certain risks and uncertainties that it experiences during volatile market conditions. These volatilities can have a severe impact on operations.&#160; The Company's revenues are derived from the sale and distribution of ethanol, distillers grains, and corn oil to customers primarily located in the United States. Corn for the production process is supplied to our plant primarily from local agricultural producers and from purchases on the open market.&#160; Ethanol sales typically average </font><font style="font-family:inherit;font-size:10pt;">80</font><font style="font-family:inherit;font-size:10pt;">-</font><font style="font-family:inherit;font-size:10pt;">85</font><font style="font-family:inherit;font-size:10pt;">% of total revenues and corn costs typically average </font><font style="font-family:inherit;font-size:10pt;">70</font><font style="font-family:inherit;font-size:10pt;">-</font><font style="font-family:inherit;font-size:10pt;">80</font><font style="font-family:inherit;font-size:10pt;">% of cost of goods sold.</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company's operating and financial performance is largely driven by the prices at which they sell ethanol and the net expense of corn. The price of ethanol is influenced by factors such as supply and demand, the weather, government policies and programs, and unleaded gasoline prices and the petroleum markets as a whole. Excess ethanol supply in the market, in particular, puts downward pressure on the price of ethanol. Our largest cost of production is corn.&#160; The cost of corn is generally impacted by factors such as supply and demand, the weather, government policies and programs, and our risk management program used to protect against the price volatility of these commodities.</font></div></div>falsefalsefalsenonnum:textBlockItemTypenaDisclosure of risks and uncertainties the company faces due to volatile market conditions and the impact on operations.No definition available.false0Risks and Uncertainties [Text Block]falseRisks and UncertaintiesUnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.granitefallsenergy.com/role/RisksAndUncertainties12