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Earnings Per Common Share (Narrative) (Details)	9 Months Ended
	Sep. 30, 2020 $ / bbl
Derivative [Line Items]
Period of trailing average of WTI	30 days
West Texas Intermediate [Member]
Derivative [Line Items]
Period of trailing average of WTI	30 days
Minimum [Member] | West Texas Intermediate [Member]
Derivative [Line Items]
Compensation reimbursement	85

X

- Definition

Compensation Reimbursement At Thirty Day Trailing Average

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Period Of Trailing Averaage Of WTI

+ References

No definition available.

+ Details

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Namespace Prefix:	tgc_
Data Type:	xbrli:durationItemType
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Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: