Note 18 - California First National Bancorp (Parent Only) Financial Information: (Details) - Condensed Statements of Earnings 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
Income:
Gain (loss) on investment securities		$ 316		$ 56		$ 2,342
Salaries & benefits		8,505		9,037		8,602
Occupancy		922		936		946
Professional services		585		578		518
Income tax expense (benefit)	4,331	4,331	5,372	5,372	6,028	6,028
Net Income		7,354	8,903	8,903	10,907	10,907
Management fee income bank subsidiary [Member] | Parent Company [Member]
Income:
Management fee income		336		123		174
Management fee income non-bank subsidiaries [Member] | Parent Company [Member]
Income:
Management fee income		628		676		795
Parent Company [Member]
Income:
Interest income non-bank subsidiaries		331		648		774
Other interest income		5		78		267
Gain (loss) on investment securities						55
		1,300		1,525		2,065
Salaries & benefits		1,332		1,202		1,182
Occupancy		142		152		94
Professional services		282		243		225
Other general & administrative		171		187		204
		1,927		1,784		1,705
Income (Loss) before taxes and equity in undistributed earnings of subsidiaries		(627)		(259)		360
Income tax expense (benefit)		(204)		262		263
Equity in undistributed earnings of subsidiaries		7,777		9,424		10,810
Net Income		$ 7,354		$ 8,903		$ 10,907