Note 3 - Securities (Details) - Debt and Equity Securities (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	$ 211,794	$ 217,708
Securities available for sale, gross unrealized gains	6,908	4,327
Securities available for sale, gross unrealized losses	(1,394)	(3,925)
Securities available for sale, estimated fair value	217,308	218,110
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	29,723	32,503
Securities available for sale, gross unrealized gains	27	4
Securities available for sale, gross unrealized losses	(848)	(2,557)
Securities available for sale, estimated fair value	28,902	29,950
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	57,411	51,318
Securities available for sale, gross unrealized gains	585	100
Securities available for sale, gross unrealized losses	(244)	(555)
Securities available for sale, estimated fair value	57,752	50,863
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	124,660	123,729
Securities available for sale, gross unrealized gains	6,296	4,223
Securities available for sale, gross unrealized losses	(302)	(813)
Securities available for sale, estimated fair value	130,654	127,139
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost		10,000
Securities available for sale, estimated fair value		10,000
Corporate and Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost		158
Securities available for sale, estimated fair value		$ 158