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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Mar. 05, 2025
Jun. 30, 2024
Cover [Abstract]      
Entity Registrant Name PHX MINERALS INC.    
Entity Central Index Key 0000315131    
Document Type 10-K    
Document Period End Date Dec. 31, 2024    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
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    
ICFR Auditor Attestation Flag false    
Entity Emerging Growth Company false    
Entity Small Business true    
Entity Shell Company false    
Entity File Number 001-31759    
Entity Tax Identification Number 73-1055775    
Entity Address, Address Line One 1320 South University Drive    
Entity Address, Address Line Two Suite 720    
Entity Address, City or Town Fort Worth    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 76107    
City Area Code 405    
Local Phone Number 948-1560    
Entity Incorporation, State or Country Code DE    
Entity Common Stock, Shares Outstanding   37,922,368  
Entity Public Float     $ 113,897,450
Document Annual Report true    
Document Transition Report false    
Title of each class Common Stock, $0.01666 par value    
Trading Symbol(s) PHX    
Name of each exchange on which registered NYSE    
Document Financial Statement Error Correction [Flag] false    
Auditor Name Ernst & Young LLP    
Auditor Firm ID 42    
Auditor Location Oklahoma    
Auditor Opinion [Text Block]

Opinion on the Financial Statements

We have audited the accompanying balance sheets of PHX Minerals Inc. (the Company) as of December 31, 2024 and 2023, the related statements of income, stockholders’ equity and cash flows for each of the two years in the period ended December 31, 2024, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the two years in the period ended December 31, 2024, in conformity with U.S. generally accepted accounting principles.