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Oil And Gas Properties (Schedule Of Oil And Gas Properties) (Q2) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Oil And Gas Properties [Abstract] |  |  |
Oil and gas properties | $ 6,687 | $ 6,751 | $ 6,503
Unevaluated properties |  |  | 23
Accumulated depreciation, depletion, and amortization | (2,642) | (2,366) | (1,722)
Oil and gas properties, net | $ 4,045 | $ 4,385 | $ 4,804

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- Definition Oil And Gas Property Unevaluated Properties + References No definition available. + Details
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Namespace Prefix: | tgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Depletion of oil and gas property carried under the full cost method. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Oil and gas properties, gross, carried under the full cost method. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Oil and gas properties, net of depletion, carried under the full cost method. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant