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Note 4 - Acquisitions and Dispositions (Details Textual) $ / shares in Units, $ in Thousands, shares in Millions |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 13, 2022 USD ($) $ / shares shares | Apr. 29, 2021 USD ($) | Feb. 25, 2021 USD ($) | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) | Feb. 24, 2021 | Nov. 30, 2006
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | $ 0.10 |  |  | $ 0.10 | $ 0.10 | $ 0.10 |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  |  | $ 10,819 | $ 7,651 | $ (0) |  |
Revenues, Total |  |  |  | $ 9,841 | 354,326 | 199,075 | 67,176 |  |
Net Income (Loss) Attributable to Parent, Total |  |  |  |  | 51,890 | 81,836 | $ (48,181) |  |
Block 5 PSA [Member] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  | 40.00%
Equity Method Investment, Additional Working Interest Percentage |  |  |  |  |  |  |  |  | 10.00%
TransGlobe [Member] | Excluded From ProForma [Member] |  |  |  |  |  |  |  |  |
Asset Impairment Charges, Total |  |  |  |  | (23,700) | 31,500 |  |  |
Severance Costs |  |  |  |  | 10,200 | 10,200 |  |  |
Business Acquisition, Transaction Costs |  |  |  | 6,500 | 6,500 |  |  |  |
TransGlobe [Member] | Pro Forma [Member] |  |  |  |  |  |  |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  |  |  | 10,800 |  |  |
Business Acquisition, Transaction Costs |  |  |  |  |  | 21,100 |  |  |
TransGlobe [Member] | Granted in 2021 [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Target Percentage | 200.00% |  |  |  |  |  |  |  |
TransGlobe [Member] | Awards Granted, 2022 [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Target Percentage | 64.40% |  |  |  |  |  |  |  |
TransGlobe [Member] | Granted in 2020 [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Target Percentage | 200.00% |  |  |  |  |  |  |  |
VAALCO Energy [Member] | Excluded From ProForma [Member] |  |  |  |  |  |  |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  |  | 10,800 |  |  |  |
Business Acquisition, Transaction Costs |  |  |  | 14,600 | 14,600 |  |  |  |
VAALCO Energy [Member] | VAALCO Stockholders [Member] |  |  |  |  |  |  |  |  |
Estimated Ownership to Be Received, Percent | 54.50% |  |  |  |  |  |  |  |
VAALCO Energy [Member] | TransGlobe Shareholders [Member] |  |  |  |  |  |  |  |  |
Estimated Ownership to Be Received, Percent | 45.50% |  |  |  |  |  |  |  |
TransGlobe [Member] |  |  |  |  |  |  |  |  |
Business Acquisition, Exchange Ratio | 0.6727 |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares | 49.3 |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  | 47,600 |  |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  | 10,000 |  |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount | $ 10,800 |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 6,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Revalued Equity Awards, Gain (Loss) | 600 |  |  |  |  |  |  |  |
TransGlobe [Member] | Awards Granted, 2022 [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Revalued Equity Awards, Gain (Loss) | $ 600 |  |  |  |  |  |  |  |
TransGlobe [Member] | Other Income (Expense), Net [Member] |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  | 14,600 |  |  |  |
Etame Marine Block [Member] |  |  |  |  |  |  |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  | $ 7,700 |  |  |  |  |  |
Working Interest Ownership, Percentage |  |  | 58.80% |  |  |  |  | 31.10% |
Business Combination, Bargain Purchase Gain, Recognized Amount, Net of Tax |  |  | $ 5,200 |  |  |  |  |  |
Business Combination, Bargain Purchase Gain, Recognized Amount, Tax Expense (Benefit) |  |  | (4,100) |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  |  | $ 5,000 |  |  |  |  |  |
Business Combination, Contingent Consideration, Measurement Period of Oil Price (Day) |  |  | 90 days |  |  |  |  |  |
Business Combination, Contingent Consideration, Oil Price Threshold |  |  | 60.00 |  |  |  |  |  |
Payment for Contingent Consideration Liability, Investing Activities |  | $ 5,000 |  |  |  |  |  |  |
Revenues, Total |  |  |  |  | 144,800 | 84,600 |  |  |
Net Income (Loss) Attributable to Parent, Total |  |  |  |  | 14,600 | 29,300 |  |  |
Etame Marine Block [Member] | Excluded From ProForma [Member] |  |  |  |  |  |  |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  |  | 7,700 |  |  |  |
Business Acquisition, Transaction Costs |  |  |  | $ 1,000 | $ 1,000 |  |  |  |
Etame Marine Block [Member] | Sasol Gabon S.A. [Member] |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 27.80% |  |  |  |  |  |
Sasol Gabon S.A. [Member] | Other Income (Expense), Net [Member] |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  | $ 1,000 |  |  |

X
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain, net of tax, recognized by the entity. + References No definition available. + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of income tax expense (benefit) on the gain recognized by the entity. + References No definition available. + Details
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- Definition The measurement period of oil price for contingent consideration of the business combination. + References No definition available. + Details
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- Definition The threshold price of oil per barrel for the contingent consideration of the business combination. + References No definition available. + Details
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- Definition The percentage of additional working interest for equity method investment. + References No definition available. + Details
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- Definition The percent amount of estimated ownership to be received. + References No definition available. + Details
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- Definition Percentage of vesting of award under share-based payment arrangement. + References No definition available. + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI https://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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