The percentage of salary for severance cost.

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The percentage of target bonus for severance cost.

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The minimum share price over a 30 day period required for award to vest under share based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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The number of vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Amount of cost capitalized for award under share-based payment arrangement.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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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.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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Name:	us-gaap_PlanNameAxis=egy_The2020LongtermIncentivePlanMember
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STOCK-BASED COMPENSATION AND OTHER BENEFIT PLANS - Narrative (Details) - USD ($)	1 Months Ended			12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2021	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jun. 25, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Cash received				$ 0	$ 400,000	$ 700,000
Compensation expense capitalized	$ 1,800,000
Granted (in shares)		549,495
Granted (in dollars per share)		$ 5.96
Intrinsic performance stock option award					500,000	600,000
Severance cost as percentage of target bonus				75.00%
Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Severance cost as percentage of salary				100.00%
Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Severance cost as percentage of salary				50.00%
Stock Appreciation Rights (SARs)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Settled in cash				$ 0	$ 200,000	400,000
Grants in period (in shares)				0	0
Intrinsic performance stock option award					$ 200,000	$ 400,000
Performance Restricted Stock Units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, award vesting period (in year)				3 years
Grants in period (in shares)	789,976			790,000
Requisite service period (in years)				10 years
Unrecognized compensation cost				$ 1,300,000
Unrecognized compensation cost weighted average period (in year)				1 year 9 months
Performance Restricted Stock Units \| Tranche One
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, award vesting period (in year)		1 year
Minimum share price over 30 Day period (in dollars per share)				$ 3.86
Share-based payment award, award vesting rights, percentage		33.33%
Performance Restricted Stock Units \| Tranche Two
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, award vesting period (in year)		2 years
Minimum share price over 30 Day period (in dollars per share)				4.45
Share-based payment award, award vesting rights, percentage		33.33%
Performance Restricted Stock Units \| Tranche Three
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, award vesting period (in year)		3 years
Minimum share price over 30 Day period (in dollars per share)				$ 5.12
Share-based payment award, award vesting rights, percentage		33.33%
Share-Based Payment Arrangement, Option
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, award vesting period (in year)				3 years
Granted (in shares)				0
Share-Based Payment Arrangement, Option \| Tranche One
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, award vesting period (in year)		1 year
Minimum share price over 30 Day period (in dollars per share)		$ 6.85
Share-based compensation arrangement by share-based payment award, expiration period (in year)		10 years
Share-based payment award, award vesting rights, percentage		33.33%
Share-Based Payment Arrangement, Option \| Tranche Two
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, award vesting period (in year)		2 years
Minimum share price over 30 Day period (in dollars per share)		$ 7.88
Share-based payment award, award vesting rights, percentage		33.33%
Share-Based Payment Arrangement, Option \| Tranche Three
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, award vesting period (in year)		3 years
Minimum share price over 30 Day period (in dollars per share)		$ 9.09
Share-based payment award, award vesting rights, percentage		33.33%
Performance Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized compensation cost				$ 600,000
Unrecognized compensation cost weighted average period (in year)				1 year 3 months 7 days
Restricted Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, award vesting period (in year)						3 years
Grants in period (in shares)				1,461,000
Unrecognized compensation cost				$ 3,800,000
Unrecognized compensation cost weighted average period (in year)				1 year 4 months 28 days
Fair value of vested restricted stock awards				$ 2,200,000	$ 5,000,000.0	$ 1,500,000
Fair value per share of restricted stock awards (in dollars per share)				$ 5.39	$ 4.42	$ 3.92
Restricted Stock Units (RSUs)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, award vesting period (in year)				3 years
Unrecognized compensation cost				$ 1,700,000
Unrecognized compensation cost weighted average period (in year)				9 months
Fair value of vested restricted stock awards				$ 300,000
Fair value per share of restricted stock awards (in dollars per share)				$ 4.78
Performance stock option awards exercised (in shares)				194,771
Performance Share Units (PSUs)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Performance stock option awards exercised (in shares)				3,671
PSUs granted target percentage					64.40%
Performance Share Units (PSUs) \| Awards Granted, 2021 and 2020
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
PSUs granted target percentage						200.00%	200.00%
Deferred Share Units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Equity instruments other than options, vested, outstanding (in shares)				101,313
The 2020 Long-Term Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares authorized (in shares)								5,500,000
Number of additional shares authorized (in shares)			3,750,000
Number of shares available for grant (in shares)				483,624