Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Feb. 28, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Document Transition Report false    
Entity File Number 1-32167    
Entity Registrant Name VAALCO Energy, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 76-0274813    
Entity Address, Address Line One 9800 Richmond Avenue    
Entity Address, Address Line Two Suite 700    
Entity Address, City or Town Houston    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77042    
City Area Code 713    
Local Phone Number 623-0801    
Title of 12(b) Security Common Stock, par value $0.10    
Trading Symbol EGY    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 64.5
Entity Common Stock, Shares Outstanding   57,663,188  
Documents Incorporated by Reference Documents incorporated by reference: Portions of the definitive Proxy Statement of VAALCO Energy, Inc. relating to the Annual Meeting of Stockholders to be filed within 120 days after the end of the fiscal year covered by this Form 10-K, which are incorporated into Part III of this Form 10-K.       
Current Fiscal Year End Date --12-31    
Entity Central Index Key 0000894627    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY