Note 15 - Regulatory Capital Requirements: (Detail) - Capital and Capital Ratio Information for the Company and Its Banking Subsidiary: (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2011
Tier 1 leverage capital	14.00%
California First National Bancorp [Member]
Tier 1 risk-based capital (in Dollars)	$ 195,751	$ 198,115
Tier 1 risk-based capital	39.50%	40.80%
Total risk-based capital (in Dollars)	200,967	203,195
Total risk-based capital	40.50%	41.90%
Tier 1 leverage capital (in Dollars)	195,751	198,115
Tier 1 leverage capital	40.70%	38.40%
California First National Bank [Member]
Tier 1 risk-based capital (in Dollars)	82,738	78,206
Tier 1 risk-based capital	19.90%	21.30%
Total risk-based capital (in Dollars)	86,840	81,803
Total risk-based capital	20.80%	22.30%
Tier 1 leverage capital (in Dollars)	$ 82,738	$ 78,206
Tier 1 leverage capital	22.40%	20.80%