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Oil And Gas Properties (Schedule Of Oil And Gas Properties) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Oil And Gas Properties [Abstract]
Oil and gas properties, at cost	$ 5,898,000		$ 5,898,000		$ 8,286,000
Unevaluated properties	552,000		552,000		552,000
Oil and gas properties	6,450,000		6,450,000		$ 8,838,000
Depletion expense			583,000	$ 1,360,000
Impairment	$ 1,445,000	$ 0	$ 2,086,000	$ 0

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
Period Type:	instant

X

- References

No definition available.

+ Details

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X

- Definition

The noncash expense charged against earnings to recognize the consumption of oil and gas reserves that are part of an entities' assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

+ Details

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- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section 35
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=28370743&loc=d3e66150-109466

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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X

- Definition

Oil and gas properties, gross, carried under the full cost method.

+ References

No definition available.

+ Details

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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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