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Document and Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2022
Dec. 06, 2022
Mar. 31, 2022
Cover [Abstract]      
Entity Registrant Name PHX MINERALS INC.    
Entity Central Index Key 0000315131    
Document Type 10-K    
Document Period End Date Sep. 30, 2022    
Amendment Flag false    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --09-30    
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 true    
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   36,528,844  
Entity Public Float     $ 67,013,392
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    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the definitive Proxy Statement of PHX Minerals Inc. (to be filed no later than 120 days after September 30, 2022) relating to the Annual Meeting of Stockholders, to be held on March 6, 2023, are incorporated into Part III of this Form 10-K.

    
Auditor Name Ernst & Young LLP    
Auditor Firm ID 42    
Auditor Location Oklahoma