XML 52 R38.htm IDEA: XBRL DOCUMENT v2.4.0.6

Derivatives (Narrative) (Details) (USD $)	0 Months Ended	9 Months Ended		7 Months Ended	9 Months Ended	17 Months Ended		0 Months Ended	17 Months Ended
	Jul. 28, 2009	Sep. 30, 2012	Sep. 30, 2011	Jul. 31, 2011 Costless Collar [Member]	Sep. 30, 2012 Costless Collar [Member]	Dec. 31, 2010 Costless Collar [Member]	Jul. 28, 2009 Costless Collar [Member]	Jun. 27, 2011 Cargill Agreement [Member]	Dec. 31, 2012 Cargill Agreement [Member]
Derivative [Line Items]
Price agreement term	2 years
Price agreement description								If the average price falls below $65 per barrel, then Cargill will pay to the Company the difference between $65 and the lower average price for 10,000 barrels per month in each month during when such lower average prices occur.
Floor price (per barrel)							60.00	65
Cap price (per barrel)							81.50
Monthly volume (in barrels)				7,375		9,500			10,000
Difference per barrel of Kansas Common plus bonus and current WTI NYMEX					7
Derivative issuance cost per barrel								2.20
Payments of derivative issuance costs								$ 374,000
Unrealized gain (loss) on derivatives		(140,000)	976,000
Settlement payments			$ (862,000)

X

- Definition

Derivative issuance cost per barrel.

+ References

No definition available.

+ Details

Name:	tgc_DerivativeIssuanceCostPerBarrel
Namespace Prefix:	tgc_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Derivative, Length Of Agreement, Years

+ References

No definition available.

+ Details

Name:	tgc_DerivativeLengthOfAgreementYears
Namespace Prefix:	tgc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Derivative Underlying Quantity Monthly Volume

+ References

No definition available.

+ Details

Name:	tgc_DerivativeUnderlyingQuantityMonthlyVolume
Namespace Prefix:	tgc_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Difference per barrel of Kansas Common plus bonus and current WTI NYMEX.

+ References

No definition available.

+ Details

Name:	tgc_DifferencePerBarrelOfKansasCommonPlusBonusAndCurrentWtiNymex
Namespace Prefix:	tgc_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Settlement payments derivative contract

+ References

No definition available.

+ Details

Name:	tgc_SettlementPaymentsDerivativeContract
Namespace Prefix:	tgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeCapPrice
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Description of the relevant terms of the derivative. Includes the type of instrument, risk being hedged, notional amount, counterparty, inception date, maturity date, relevant interest rates, strike price, cap price, and floor price.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeDescriptionOfTerms
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFloorPrice
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash outflow for cost incurred directly with the issuance of a derivative security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18, 19, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfDerivativeIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: 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=6943989&loc=d3e3602-108585

+ Details

Name:	us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration