Document And Entity Information - shares	6 Months Ended
	Dec. 31, 2018	Feb. 01, 2019
Document Information [Line Items]
Entity Registrant Name	BION ENVIRONMENTAL TECHNOLOGIES INC
Entity Central Index Key	0000875729
Trading Symbol	bnet
Current Fiscal Year End Date	--06-30
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Common Stock, Shares Outstanding (in shares)		26,819,980
Document Type	10-Q
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false