Note 18 - California First National Bancorp (Parent Only) Financial Information: (Details) - Condensed Statements of Cash Flows of California First National Bancorp: (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income		$ 7,354	$ 8,903	$ 8,903	$ 10,907	$ 10,907
Adjustments to reconcile net earnings to cash flows:
Deferred income taxes	(5,280)	(5,477)	(172)	65	4,917	7,913
Other, net		(55)		(107)		(1,466)
Net cash (used for) provided by operating activities		1,767		9,937		15,643
CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash provided by investing activities		(53,129)		(7,573)		(52,521)
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividends paid		(22,985)		(11,462)		(10,288)
Net cash used for financing activities		69,910		(42,745)		60,192
NET CHANGE IN CASH AND CASH EQUIVALENTS		18,548		(40,381)		23,314
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD		56,921		97,302		73,988
CASH AND CASH EQUIVALENTS AT END OF PERIOD	75,469	75,469	56,921	56,921	97,302	97,302
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income		7,354		8,903		10,907
Adjustments to reconcile net earnings to cash flows:
Amortization of premiums or discounts on securities, net				1		32
Net (gain) loss recognized on investment securities						(55)
Deferred income taxes		558		(290)		(1,098)
Equity in undistributed earnings of subsidiaries		(7,777)		(9,424)		(10,810)
Net change in other liabilities		(797)		134		153
Net change in other assets		(347)		318		2,509
Other, net		(25)		(157)		16
Net cash (used for) provided by operating activities		(1,034)		(515)		1,654
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sale of investment securities				2,270		6,971
Payments for investments in and (advances to) subsidiaries		22,192		9,345		(784)
Net cash provided by investing activities		22,192		11,615		6,187
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock		164		195		1,627
Dividends paid		(22,985)		(11,462)		(10,288)
Net cash used for financing activities		(22,821)		(11,267)		(8,661)
NET CHANGE IN CASH AND CASH EQUIVALENTS		(1,663)		(167)		(820)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD		6,247		6,414		7,234
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 4,584	$ 4,584	$ 6,247	$ 6,247	$ 6,414	$ 6,414