XML 60 R49.htm IDEA: XBRL DOCUMENT
v3.19.2

Derivatives and Fair Value (Summary of Commodity Swaps) (Details) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 $ / bbl bbl | May 06, 2019 $ / bbl | Jun. 30, 2018 $ / bbl
Barrels | 500,000 |  |
Commodity Contract, June 2018 Through June 2019 [Member] |  |  |
Barrels | 225,130 |  |
Weighted Average Fixed Price | $ / bbl | 66.70 |  | 74.00
Commodity Contract, July 19 Through June 2020 [Member] |  |  |
Barrels | 274,870 |  |
Weighted Average Fixed Price | $ / bbl | 66.70 | 66.70 |

X
- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix: | us-gaap_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition Average fixed price related to the group of price risk swap derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeSwapTypeAverageFixedPrice
Namespace Prefix: | us-gaap_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=egy_CommodityContractJune2018ThroughJune2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=egy_CommodityContractJuly19ThroughJune2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |