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Note 10 - Deposits (Details Textual) - USD ($) $ in Millions	Jun. 30, 2016	Jun. 30, 2015
Savings Deposits, Related Party	$ 20.2
Time Deposits 250,000 or More	$ 128.0	$ 82.2

The amount of outstanding savings deposits from affiliates.

No definition available.

Name:	cfnb_SavingsDepositsRelatedParty
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The amount of outstanding time deposits with a balance of $250,000 or more.

No definition available.

Name:	cfnb_TimeDeposits250000OrMore
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant