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Cover - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 14, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-31398    
Entity Registrant Name NATURAL GAS SERVICES GROUP, INC.    
Entity Incorporation, State or Country Code CO    
Entity Tax Identification Number 75-2811855    
Entity Address, Address Line One 404 Veterans Airpark Lane, Suite 300    
Entity Address, City or Town Midland    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 79705    
City Area Code (432)    
Local Phone Number 262-2700    
Title of 12(b) Security Common Stock, $.01 par value    
Trading Symbol NGS    
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     $ 129,415,763
Entity Common Stock, Shares Outstanding   12,717,486  
Documents Incorporated by Reference
Documents incorporated by reference

Certain information called for in Items 10, 11, 12, 13 and 14 of Part III are incorporated by reference to the registrant’s definitive proxy statement for the annual meeting of shareholders expected to be held on June 16, 2022.
    
Entity Central Index Key 0001084991    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false