Amount of consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Includes amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor.

No definition available.

Name:	us-gaap_SaleOfStockConsiderationReceivedPerTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

No definition available.

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

No definition available.

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

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

Name:	us-gaap_StatementScenarioAxis=gpne_IssuanceDateFiveMember
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Data Type:	na
Balance Type:
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Name:	us-gaap_StatementScenarioAxis=gpne_IssuanceDateFourMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_StatementScenarioAxis=gpne_IssuanceDateMember
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Data Type:	na
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Name:	us-gaap_StatementScenarioAxis=gpne_IssuanceDateOneMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_StatementScenarioAxis=gpne_IssuanceDateThreeMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_StatementScenarioAxis=gpne_IssuanceDateTwoMember
Namespace Prefix:
Data Type:	na
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