Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Acquisitions and Dispositions (Details Textual)

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Note 3 - Acquisitions and Dispositions (Details Textual)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Oct. 13, 2022
USD ($)
$ / shares
shares
Mar. 31, 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  
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   43.7    
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   9.7    
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