Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities
Net income (loss) from continuing operations	$ (788)	$ 2,956	$ 4,244
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, depletion, and amortization	3,030	2,912	3,403
Amortization of loan fees-interest expense	17us-gaap_AmortizationOfFinancingCosts	32us-gaap_AmortizationOfFinancingCosts	55us-gaap_AmortizationOfFinancingCosts
Accretion of discount on asset retirement obligation	114	120	132
Impairment	2,796us-gaap_AssetImpairmentCharges
Gain on sale of vehicles/equipment	(33)	(118)	(83)
Compensation and services paid in stock options / equipment	32us-gaap_ShareBasedCompensation	50us-gaap_ShareBasedCompensation	52us-gaap_ShareBasedCompensation
Deferred income tax expense	(12)us-gaap_DeferredIncomeTaxExpenseBenefit	1,915us-gaap_DeferredIncomeTaxExpenseBenefit	2,226us-gaap_DeferredIncomeTaxExpenseBenefit
Loss on derivatives			142us-gaap_UnrealizedGainLossOnDerivatives
Allowance for doubtful accounts		(84)	257
Changes in assets and liabilities
Restricted cash	121		(386)
Accounts receivable	576	307	(89)
Inventory and other assets	450us-gaap_IncreaseDecreaseInInventories	31us-gaap_IncreaseDecreaseInInventories	(694)us-gaap_IncreaseDecreaseInInventories
Accounts payable	58	103	196
Accrued liabilities	323	(184)	(95)
Settlement on asset retirement obligation	(113)	(69)	(52)
Net cash provided by operating activities - continuing operations	6,571	7,971	9,308
Net cash (used in) in operating activities - discontinued operations		(85)	(265)
Net cash provided by operating activities	6,571	7,886	9,043
Investing activities
Net additions to oil and gas properties	(3,708)	(2,314)	(8,116)
Additions to Manufactured Methane facilities	(282)	(2)	(464)
Section 1603 refund Manufactured Methane facilities			1,000
Additions to other property & equipment	(21)	(8)	(15)
Proceeds from sale of other property & equipment	17	106	22
Net cash (used in) investing activities - continuing operations	(3,994)	(2,218)	(7,573)
Net cash provided by investing activities - discontinued operations		1,395
Net cash (used in) investing activities	(3,994)	(823)	(7,573)
Financing activities
Proceeds from exercise of options/warrants			52
Payment in lieu of exercise of options/warrants		(60)tgc_PaymentsInLieuStockOptionsExercised
Proceeds from borrowings	7,709us-gaap_ProceedsFromLinesOfCredit	7,946us-gaap_ProceedsFromLinesOfCredit	18,339us-gaap_ProceedsFromLinesOfCredit
Repayments of borrowings	(10,305)us-gaap_RepaymentsOfDebt	(13,606)us-gaap_RepaymentsOfDebt	(20,133)us-gaap_RepaymentsOfDebt
Loan fees		(10)us-gaap_PaymentsOfLoanCosts	(30)us-gaap_PaymentsOfLoanCosts
Net cash provided by (used in) financing activities - continuing operations	(2,596)	(5,730)	(1,772)
Net cash provided by (used in) financing activities - discontinued operations		(1,310)	265
Net cash provided by (used in) financing activities	(2,596)	(7,040)	(1,507)
Net change in cash and cash equivalents - continuing operations	(19)	23	(37)
Cash and cash equivalents, beginning of period	54	31	68
Cash and cash equivalents, end of period	35	54	31
Supplemental cash flow information:
Cash interest payments	71us-gaap_InterestPaid	325us-gaap_InterestPaid	688us-gaap_InterestPaid
Cash paid for taxes		38us-gaap_IncomeTaxesPaidNet	67us-gaap_IncomeTaxesPaidNet
Supplemental non-cash investing and financing activities:
Financed company vehicles	47tgc_FinancedCompanyVehicles	188tgc_FinancedCompanyVehicles	175tgc_FinancedCompanyVehicles
Asset retirement obligations incurred	46	26	92
Revisions to asset retirement obligations	138	(48)
Capital expenditures included in accounts payable and accrued liabilities	$ 207	$ 175

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- Definition

Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 28

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- Definition

The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The cash outflow for loan origination associated cost which is usually collected through escrow.

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-Publisher FASB

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- Definition

The cash outflow for acquisition of or capital improvements of property, plant and equipment, used to produce goods or deliver services, and not otherwise defined in the taxonomy.

+ References

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash outflow for exploration and development of oil and gas properties. It includes cash payments related to development of oil and gas wells drilled at previously untested geologic structures (to determine the presence of oil or gas) and wells drilled at sites where the presence of oil or gas has already been established (to extract the oil or gas).

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.4-08.(f))

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-Subparagraph (b)

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- Definition

The cash inflow from sale of other property, plant and equipment, used to produce goods or deliver services, and not otherwise defined in the taxonomy.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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-Publisher FASB

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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