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Note 3 - Acquisitions and Dispositions (Details Textual) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 13, 2022 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) $ / shares | Mar. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) $ / shares | Dec. 31, 2022 $ / shares | Nov. 30, 2006
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | $ 0.10 | $ 0.10 |  | $ 0.10 | $ 0.10 |
Block 5 PSA [Member] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 40.00%
Equity Method Investment, Additional Working Interest Percentage |  |  |  |  |  | 10.00%
Excluded From ProForma [Member] | TransGlobe [Member] |  |  |  |  |  |
Asset Impairment Charges |  |  | $ 26.0 |  |  |
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, Bargain Purchase, Increase (Decrease) of Gain Recognized, Amount |  |  |  | $ 1.4 |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | $ 31.3 |  | 75.0 |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  | 8.0 |  | 1.7 |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount | $ 10.8 |  | $ 9.4 |  |  |
TransGlobe [Member] | Foreign Tax Authority [Member] | Egyptian Tax Authority [Member] |  |  |  |  |  |
Business Combination, Deferred Tax Liability Assumed |  | $ 1.4 |  | $ 1.4 |  |

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