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Statements of Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Oct. 31, 2014
Statements of Stockholders' Equity [Abstract]
Convertible notes exercised price per share	$ 0.00825grep_ConvertibleNotesExercisedPricePerShare
Subscriptions received under initial public offering per share	$ 0.25grep_SubscriptionsReceivedUnderInitialPublicOfferingPerShare
Subscriptions received under private placements per share	$ 0.25grep_SubscriptionsReceivedUnderPrivatePlacementsPerShare

X

- Definition

Convertible notes exercised price per share.

+ References

No definition available.

+ Details

Name:	grep_ConvertibleNotesExercisedPricePerShare
Namespace Prefix:	grep_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Subscriptions received under initial public offering per share.

+ References

No definition available.

+ Details

Name:	grep_SubscriptionsReceivedUnderInitialPublicOfferingPerShare
Namespace Prefix:	grep_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Subscriptions received under private placements per share.

+ References

No definition available.

+ Details

Name:	grep_SubscriptionsReceivedUnderPrivatePlacementsPerShare
Namespace Prefix:	grep_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration