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DIVIDENDS (Details) (USD $)	Jun. 30, 2012	May 14, 2012	Apr. 20, 2012
DIVIDENDS
Percentage of dividend declared on common stock			5.00%
Percentage of dividend paid on common stock		5.00%
Amount of cash paid in lieu of fractional shares	$ 1,150

X

- Definition

Represents the amount of cash paid in lieu of fractional shares to shareholders in the form of dividend.

+ References

No definition available.

+ Details

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Namespace Prefix:	tge_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the percentage of dividend declared on outstanding common shares.

+ References

No definition available.

+ Details

Name:	tge_CommonStockDividendsDeclaredPercentage
Namespace Prefix:	tge_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the percentage of dividend paid on outstanding common shares.

+ References

No definition available.

+ Details

Name:	tge_CommonStockDividendsPaidPercentage
Namespace Prefix:	tge_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	tge_DividendsDisclosureAbstract
Namespace Prefix:	tge_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration