XML 77 R64.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Supplemental Oil And Gas Information (Schedule Of Reserve Value By Category And The Respective Present Values, Before Income Taxes, Discounted At 10% As A Percentage Of Total Proved Reserves) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reserve Quantities [Line Items] |  |  |
Total proved reserves year-end reserve report | $ 8,287 | $ 40,417 | $ 47,856
Proved developed producing reserves (PDP) | $ 7,686 | $ 32,059 | $ 34,440
% of PDP reserves to total proved reserves | 93.00% | 79.00% | 72.00%
Proved developed non-producing reserves | $ 601 | $ 2,956 | $ 4,868
% of PDNP reserves to total proved reserves | 7.00% | 7.00% | 10.00%
Proved undeveloped reserves (PUD) |  | $ 5,402 | $ 8,548
% of PUD reserves to total proved reserves |  | 14.00% | 18.00%
Oil [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Total proved reserves year-end reserve report | $ 8,287 | $ 40,417 | $ 47,856
Proved developed producing reserves (PDP) | $ 7,686 | $ 32,059 | $ 34,440
% of PDP reserves to total proved reserves | 93.00% | 79.00% | 72.00%
Proved developed non-producing reserves | $ 601 | $ 2,956 | $ 4,868
% of PDNP reserves to total proved reserves | 7.00% | 7.00% | 10.00%
Proved undeveloped reserves (PUD) |  | $ 5,402 | $ 8,548
% of PUD reserves to total proved reserves |  | 14.00% | 18.00%

X
- Definition Percent Of Proved Developed Non-Producing Reserves To Total Proved Reserves + References No definition available. + Details
Name: | tgc_PercentOfProvedDevelopedNonProducingReservesToTotalProvedReserves
Namespace Prefix: | tgc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent Of Proved Developed Producing Reserves To Total Proved Reserves + References No definition available. + Details
Name: | tgc_PercentOfProvedDevelopedProducingReservesToTotalProvedReserves
Namespace Prefix: | tgc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent Of Proved Undeveloped Reserves To Total Proved Reserves + References No definition available. + Details
Name: | tgc_PercentOfProvedUndevelopedReservesToTotalProvedReserves
Namespace Prefix: | tgc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proved Developed Non-Producing Reserves + References No definition available. + Details
Name: | tgc_ProvedDevelopedNonProducingReserves
Namespace Prefix: | tgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proved Developed Producing Reserves + References No definition available. + Details
Name: | tgc_ProvedDevelopedProducingReserves
Namespace Prefix: | tgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proved Reserves + References No definition available. + Details
Name: | tgc_ProvedReserves
Namespace Prefix: | tgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proved Undeveloped Reserves + References No definition available. + Details
Name: | tgc_ProvedUndevelopedReserves
Namespace Prefix: | tgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
Name: | us-gaap_ReserveQuantitiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ReserveQuantitiesByTypeOfReserveAxis=us-gaap_OilReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |