Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Crude Oil and Natural Gas Properties and Equipment (Details Textual)

v3.22.2.2
Note 7 - Crude Oil and Natural Gas Properties and Equipment (Details Textual)
$ in Millions
9 Months Ended
Jun. 20, 2026
Sep. 25, 2018
Sep. 30, 2022
USD ($)
Sep. 16, 2028
Apr. 12, 2021
Feb. 25, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 17, 2018
USD ($)
Dec. 31, 2012
Block P Offshore Equatorial Guinea [Member]                    
Business Acquisition, Percentage of Voting Interests Acquired             12.00%     31.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage             43.00%      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High             $ 3.1      
Etame Marine Block [Member]                    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage           58.80%        
Unproved Oil and Gas Property, Successful Effort Method           $ 2.2        
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member]                    
Deferred Tax Assets, Property, Plant and Equipment                 $ 18.6  
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Signing Bonus [Member]                    
Capitalized Costs, Unproved Properties                 6.7  
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Tax Effect [Member]                    
Capitalized Costs, Unproved Properties                 $ 7.1  
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Forecast [Member] | Etame Marine Block [Member]                    
Increase (Decrease) in Working Interest Ownership Percentage 1.60%                  
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Vaalco Energy Inc. and Other Etame Marin Block Owners [Member]                    
Period of Agreement for Exploitation Areas (Year)   10 years                
Entitled Percent for Consortium After Initial Royalty Percentage   80.00%                
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Vaalco Energy Inc. and Other Etame Marin Block Owners [Member] | Forecast [Member]                    
Entitled Percent for Consortium After Initial Royalty Percentage       70.00%            
Etame Marine Block [Member]                    
Equity Method Investment, Ownership Percentage   63.575%                
Unproved Oil and Gas Property, Successful Effort Method               $ 2.3    
Undeveloped Leasehold Value     $ 13.7         $ 11.5    
Etame Marine Block [Member] | Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member]                    
Number of Exploitation Areas   3                
Period of Agreement for Exploitation Areas (Year)   10 years                
Number of Contract Extension Periods   2                
Production License Agreement Term Extended by Government (Year)   5 years                
Etame Marine Block [Member] | Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Forecast [Member]                    
Increase (Decrease) in Working Interest Ownership Percentage 2.50%                  
Block P Offshore Equatorial Guinea [Member]                    
Equity Method Investment, Ownership Percentage         45.90%          
Unproved Oil and Gas Property, Successful Effort Method     $ 10.0              
Period of Development Area (Year)     25 years