Quarterly Financial Data (Unaudited) Quarterly Financial Data (Details) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended
Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Jul. 31, 2013	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 63,783,301us-gaap_Revenues	$ 78,383,846us-gaap_Revenues	$ 81,324,024us-gaap_Revenues	$ 77,463,813us-gaap_Revenues	$ 80,079,134us-gaap_Revenues	$ 48,020,602us-gaap_Revenues	$ 47,117,122us-gaap_Revenues	$ 49,955,382us-gaap_Revenues	$ 42,435,763us-gaap_Revenues	$ 39,025,122us-gaap_Revenues	$ 43,745,776us-gaap_Revenues	$ 48,884,076us-gaap_Revenues	$ 300,954,984us-gaap_Revenues	$ 224,100,934us-gaap_Revenues	$ 175,162,043us-gaap_Revenues
Gross Profit	14,844,764us-gaap_GrossProfit	16,043,874us-gaap_GrossProfit	18,212,259us-gaap_GrossProfit	14,420,458us-gaap_GrossProfit	6,311,018us-gaap_GrossProfit	3,629,972us-gaap_GrossProfit	832,144us-gaap_GrossProfit	(1,946,091)us-gaap_GrossProfit	54,694us-gaap_GrossProfit	657,416us-gaap_GrossProfit	3,687,950us-gaap_GrossProfit	2,710,179us-gaap_GrossProfit	63,521,355us-gaap_GrossProfit	14,023,313us-gaap_GrossProfit	2,453,969us-gaap_GrossProfit
Operating Income (Loss)	13,580,276us-gaap_OperatingIncomeLoss	14,833,232us-gaap_OperatingIncomeLoss	16,832,384us-gaap_OperatingIncomeLoss	13,124,957us-gaap_OperatingIncomeLoss	5,521,116us-gaap_OperatingIncomeLoss	3,047,007us-gaap_OperatingIncomeLoss	269,449us-gaap_OperatingIncomeLoss	(2,489,589)us-gaap_OperatingIncomeLoss	(597,187)us-gaap_OperatingIncomeLoss	66,935us-gaap_OperatingIncomeLoss	3,024,214us-gaap_OperatingIncomeLoss	2,197,158us-gaap_OperatingIncomeLoss	58,370,849us-gaap_OperatingIncomeLoss	11,034,730us-gaap_OperatingIncomeLoss	4,373us-gaap_OperatingIncomeLoss
Net Income (Loss) Available to Members	$ 10,951,485gfe_NetIncomeLossAvailableToMembers	$ 13,018,046gfe_NetIncomeLossAvailableToMembers	$ 14,249,413gfe_NetIncomeLossAvailableToMembers	$ 10,554,947gfe_NetIncomeLossAvailableToMembers	$ 4,604,950gfe_NetIncomeLossAvailableToMembers	$ 3,031,943gfe_NetIncomeLossAvailableToMembers	$ 221,427gfe_NetIncomeLossAvailableToMembers	$ (2,432,510)gfe_NetIncomeLossAvailableToMembers	$ (565,637)gfe_NetIncomeLossAvailableToMembers	$ 116,466gfe_NetIncomeLossAvailableToMembers	$ 3,042,288gfe_NetIncomeLossAvailableToMembers	$ 2,173,701gfe_NetIncomeLossAvailableToMembers
Earnings Per Share, Diluted	$ 357.82us-gaap_EarningsPerShareBasicAndDiluted	$ 425.34us-gaap_EarningsPerShareBasicAndDiluted	$ 465.58us-gaap_EarningsPerShareBasicAndDiluted	$ 344.87us-gaap_EarningsPerShareBasicAndDiluted	$ 159.31us-gaap_EarningsPerShareBasicAndDiluted	$ 99.06us-gaap_EarningsPerShareBasicAndDiluted	$ 7.23us-gaap_EarningsPerShareBasicAndDiluted					$ 71.02us-gaap_EarningsPerShareBasicAndDiluted	$ 1,593.61us-gaap_EarningsPerShareBasicAndDiluted	$ 327.78us-gaap_EarningsPerShareBasicAndDiluted	$ 5.25us-gaap_EarningsPerShareBasicAndDiluted
Earnings Per Share, Diluted								$ (79.36)us-gaap_EarningsPerShareDiluted	$ (18.49)us-gaap_EarningsPerShareDiluted	$ 3.81us-gaap_EarningsPerShareDiluted	$ 99.29us-gaap_EarningsPerShareDiluted

The portion of profit or loss for the period, which is available to the members.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

No definition available.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.21)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 18

-Article 7

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 20

-Article 5

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 21

-Article 9

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The net result for the period of deducting operating expenses from operating revenues.

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No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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