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Note 4 - Acquisitions and Dispositions (Details Textual) $ / shares in Units, $ in Thousands, shares in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 13, 2022 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($)
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | $ 0.1 | $ 0.1 | $ 0.1 |
Net Income (Loss) Attributable to Parent, Total |  | $ 60,354 | $ 51,890 | $ 81,836
Excluded From ProForma [Member] | TransGlobe [Member] |  |  |  |
Asset Impairment Charges, Total |  |  | (23,700) | 31,500
Severance Costs |  |  | 10,200 | 10,200
Business Acquisition, Transaction Costs |  |  | 6,500 |
Pro Forma [Member] | TransGlobe [Member] |  |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  | 10,800
Business Acquisition, Transaction Costs |  |  |  | 21,100
VAALCO Energy [Member] | Excluded From ProForma [Member] |  |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  | 10,800 |
Business Acquisition, Transaction Costs |  |  | 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, Bargain Purchase, Increase (Decrease) of Gain Recognized, Amount |  | (1,400) |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount | $ 10,800 |  |  |
TransGlobe [Member] | Foreign Tax Authority [Member] | Egyptian Tax Authority [Member] |  |  |  |
Business Combination, Deferred Tax Liability Assumed |  | $ 1,400 |  |
Etame Marine Block [Member] |  |  |  |
Net Income (Loss) Attributable to Parent, Total |  |  | $ 14,600 |
Etame Marine Block [Member] | Excluded From ProForma [Member] |  |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  | 7,700
Business Acquisition, Transaction Costs |  |  |  | $ 1,000

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