XML 29 R25.htm IDEA: XBRL DOCUMENT
v3.20.1

Oil And Gas Properties (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Oil And Gas Properties [Abstract] |
Schedule Of Oil And Gas Properties |
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿ |  | December 31,
﻿ |  | 2019 |  | 2018
﻿Oil and gas properties |  | $ | 6,751 |  | $ | 6,503
﻿Unevaluated properties |  |  | — |  |  | 23
﻿Accumulated depreciation, depletion and amortization |  |  | (2,366) |  |  | (1,722)
﻿Oil and gas properties, net |  | $ | 4,385 |  | $ | 4,804
﻿

X
- Definition Oil And Gas Property Full Cost Method Net [Table Text Block] + References No definition available. + Details
Name: | tgc_OilAndGasPropertyFullCostMethodNetTableTextBlock
Namespace Prefix: | tgc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration