Note 5 - Securities (Details) - Fair Value and Associated Unrealized Losses on Investments (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Available-for-sale securities
Fair value, Less than 12 months	$ 35,881	$ 133,081
Unrealized losses, Less than 12 months	(268)	(4,454)
Fair value, 12 months or more	33,946	12,937
Unrealized losses, 12 months or more	(786)	(947)
Fair value, total	69,827	146,018
Unrealized losses, total	(1,054)	(5,401)
US Government Agencies Debt Securities [Member]
Available-for-sale securities
Fair value, Less than 12 months		5,446
Unrealized losses, Less than 12 months		(147)
Fair value, 12 months or more	2,853	819
Unrealized losses, 12 months or more	(48)	(169)
Fair value, total	2,853	6,265
Unrealized losses, total	(48)	(316)
Obligations of States and Political Subdivisions [Member]
Available-for-sale securities
Fair value, Less than 12 months	6,528	29,943
Unrealized losses, Less than 12 months	(21)	(1,578)
Fair value, 12 months or more	5,942	2,727
Unrealized losses, 12 months or more	(68)	(255)
Fair value, total	12,470	32,670
Unrealized losses, total	(89)	(1,833)
Held-to-maturity securities
Fair value, Less than 12 months	3,662	23,800
Unrealized losses, Less than 12 months	(18)	(1,524)
Fair value, 12 months or more	15,565	7,533
Unrealized losses, 12 months or more	(605)	(1,183)
Fair value, total	19,227	31,333
Unrealized losses, total	(623)	(2,707)
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]
Available-for-sale securities
Fair value, Less than 12 months	15,434	44,197
Unrealized losses, Less than 12 months	(107)	(1,214)
Fair value, 12 months or more	5,623	3,271
Unrealized losses, 12 months or more	(156)	(139)
Fair value, total	21,057	47,468
Unrealized losses, total	(263)	(1,353)
Corporate Debt Securities [Member]
Available-for-sale securities
Fair value, Less than 12 months	5,078	32,649
Unrealized losses, Less than 12 months	(36)	(792)
Fair value, 12 months or more	9,916	2,960
Unrealized losses, 12 months or more	(168)	(96)
Fair value, total	14,994	35,609
Unrealized losses, total	(204)	(888)
Commercial Mortgage Backed Securities [Member]
Available-for-sale securities
Fair value, Less than 12 months	2,869	5,543
Unrealized losses, Less than 12 months	(37)	(205)
Fair value, 12 months or more	2,600	1,437
Unrealized losses, 12 months or more	(127)	(175)
Fair value, total	5,469	6,980
Unrealized losses, total	(164)	(380)
Other Asset Backed Securities [Member]
Available-for-sale securities
Fair value, Less than 12 months	5,972	15,303
Unrealized losses, Less than 12 months	(67)	(518)
Fair value, 12 months or more	7,012	1,723
Unrealized losses, 12 months or more	(219)	(113)
Fair value, total	12,984	17,026
Unrealized losses, total	$ (286)	$ (631)