Note 7 - Investment Securities (Detail) - Securities With Unrealized Losses (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Securities with unrealized losses - less than 12 Months - Fair Value	$ 25,784	$ 11,520
Securities with unrealized losses - less than 12 Months - Unrealized Losses	(198)	(88)
Securities with unrealized losses - 12 Months or more - Fair Value	711	1,597
Securities with unrealized losses - 12 Months or more - Unrealized Losses	(22)	(55)
Securities with unrealized losses - Fair Value	26,495	13,117
Securities with unrealized losses - Unrealized Losses	(220)	(143)
US Government and Government Sponsored Entities [Member]
Securities with unrealized losses - less than 12 Months - Fair Value	2,927	4,932
Securities with unrealized losses - less than 12 Months - Unrealized Losses	(2)	(46)
Securities with unrealized losses - 12 Months or more - Fair Value		0
Securities with unrealized losses - 12 Months or more - Unrealized Losses		0
Securities with unrealized losses - Fair Value	2,927	4,932
Securities with unrealized losses - Unrealized Losses	(2)	(46)
US States and Political Subdivisions Debt Securities [Member]
Securities with unrealized losses - less than 12 Months - Fair Value	490	505
Securities with unrealized losses - less than 12 Months - Unrealized Losses	(5)	(8)
Securities with unrealized losses - 12 Months or more - Fair Value	711	1,597
Securities with unrealized losses - 12 Months or more - Unrealized Losses	(22)	(55)
Securities with unrealized losses - Fair Value	1,201	2,102
Securities with unrealized losses - Unrealized Losses	(27)	(63)
Collateralized Mortgage Obligations [Member]
Securities with unrealized losses - less than 12 Months - Fair Value	22,367	6,083
Securities with unrealized losses - less than 12 Months - Unrealized Losses	(191)	(34)
Securities with unrealized losses - 12 Months or more - Fair Value		0
Securities with unrealized losses - 12 Months or more - Unrealized Losses		0
Securities with unrealized losses - Fair Value	22,367	6,083
Securities with unrealized losses - Unrealized Losses	$ (191)	$ (34)