Note 15 - Regulatory Capital Requirements: (Details) - Capital and Capital Ratio Information for the Company and Its Banking Subsidiary: (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012
California First National Bancorp [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 risk-based capital (in Dollars)	$ 180,289	$ 195,751
Tier 1 risk-based capital	32.90%	39.50%
Total risk-based capital (in Dollars)	185,436	200,967
Total risk-based capital	33.80%	40.50%
Tier 1 leverage capital (in Dollars)	180,289	195,751
Tier 1 leverage capital	32.10%	40.70%
California First National Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 risk-based capital (in Dollars)	97,699	82,738
Tier 1 risk-based capital	20.40%	19.90%
Total risk-based capital (in Dollars)	102,358	86,840
Total risk-based capital	21.40%	20.80%
Tier 1 leverage capital (in Dollars)	$ 97,699	$ 82,738
Tier 1 leverage capital	20.40%	22.40%