Document And Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2021	Sep. 10, 2021	Dec. 31, 2020
Document Information [Line Items]
Entity Registrant Name	CONSUMERS BANCORP INC /OH/
Entity Central Index Key	0001006830
Trading Symbol	cbkm
Current Fiscal Year End Date	--06-30
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding (in shares)		3,028,100
Entity Public Float			$ 52,392,039
Entity Shell Company	false
Document Type	10-K
Document Period End Date	Jun. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Title of 12(g) Security	Common Shares, no par value