v3.25.2
Cover - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2025
Aug. 01, 2025
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Annual Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2025  
Current Fiscal Year End Date --06-30  
Entity File Number 000-19333  
Entity Registrant Name BION ENVIRONMENTAL TECHNOLOGIES, INC.  
Entity Central Index Key 0000875729  
Entity Tax Identification Number 84-1176672  
Entity Incorporation, State or Country Code CO  
Entity Address, Address Line One 9 East Park Court  
Entity Address, City or Town Old Bethpage  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 11804  
City Area Code 406  
Local Phone Number 839-0816  
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 $ 8,800  
Entity Common Stock, Shares Outstanding   56,682,167
Documents Incorporated by Reference [Text Block] None  
ICFR Auditor Attestation Flag false  
Document Financial Statement Error Correction [Flag] false  
Auditor Name Haynie & Company  
Auditor Firm ID 457  
Auditor Location Salt Lake City, Utah