Document And Entity Information (USD $)	12 Months Ended
	Jun. 30, 2013	Sep. 05, 2013	Dec. 31, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	BION ENVIRONMENTAL TECHNOLOGIES INC
Document Type	10-K
Current Fiscal Year End Date	--06-30
Entity Common Stock, Shares Outstanding		17,357,981
Entity Public Float			$ 14,600,000
Amendment Flag	false
Entity Central Index Key	0000875729
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Smaller Reporting Company
Entity Well-known Seasoned Issuer	No
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY