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Oil And Gas Properties (Schedule Of Oil And Gas Properties) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Oil And Gas Properties [Abstract]
Oil and gas properties	$ 5,704	$ 5,315
Unevaluated properties		106
Accumulated depreciation, depletion, and amortization	(984)	(196)
Oil and gas properties, net	$ 4,720	$ 5,225

X

- 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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X

- 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
Period Type:	instant

X

- 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
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X

- Definition

Oil and gas properties, net of depletion, carried under the full cost method.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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