Cover - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Aug. 01, 2023
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2023
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
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	(516)
Local Phone Number	586-5643
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	$ 46.5
Entity Common Stock, Shares Outstanding			48,703,905
Document financial statement error correction	false
Auditor Firm ID	457	286
Auditor Name	Haynie & Company	Eide Baily LLP
Auditor Location	Salt Lake City, Utah	Denver, Colorado