Annual report pursuant to Section 13 and 15(d)

Note 4 - Acquisitions and Dispositions (Details Textual)

v3.23.1
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