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v3.20.2

Leases (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Leases [Abstract] |  |
ROU Assets | $ 2,114 | $ 2,357
Current portion of operating lease liabilities | 476 | 479
Noncurrent portion of operating lease liabilities | 1,684 | 1,917
Total | $ 2,160 | $ 2,396

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- Definition Present values of lessee's discounted obligation for lease payments from operating lease, classified as current. + References No definition available. + Details
Name: | gne_OperatingLeaseLiabilitiesCurrent
Namespace Prefix: | gne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Present value of lessee's discounted obligation for lease payment fromurren operating lease, classified as nonct. + References No definition available. + Details
Name: | gne_OperatingLeaseLiabilitiesNoncurrent
Namespace Prefix: | gne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under operating leases. + References No definition available. + Details
Name: | gne_OperatingLeaseRightOfUseAssets
Namespace Prefix: | gne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant