Note 2 - Securities (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018	Jun. 30, 2017
Available-for-sale Securities Income Tax Provision on Gross Realized Gains	$ 1	$ 118	$ 9	$ 12	$ 71

This item represents the tax provision (benefit) applicable to gross profit (loss) realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

No definition available.

Name:	cbkm_AvailableForSaleSecuritiesIncomeTaxProvisionOnGrossRealizedGains
Namespace Prefix:	cbkm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration