Note 3 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Note 3 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Securities in a continuous unrealized loss position, less than 12 months, fair value	$ 27,506	$ 79,695
Securities in a continuous unrealized loss position, less than 12 months, unrealized losses	142	4,126
Securities in a continuous unrealized loss position, 12 months or more, fair value	5,657	12,670
Securities in a continuous unrealized loss position, 12 months or more, unrealized losses	2,129	3,041
Securities in a continuous unrealized loss position, fair value	33,163	92,365
Securities in a continuous unrealized loss position, unrealized losses	2,271	7,167
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value	19,766
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses	92
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value	9,232
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses	52
Held to maturity securities in a continuous unrealized loss position, fair value	28,998
Held to maturity securities in a continuous unrealized loss position, unrealized losses	144
Collateralized Mortgage Obligations [Member]
Note 3 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Securities in a continuous unrealized loss position, less than 12 months, fair value	17,331	73,137
Securities in a continuous unrealized loss position, less than 12 months, unrealized losses	96	3,923
Securities in a continuous unrealized loss position, 12 months or more, fair value	0	8,697
Securities in a continuous unrealized loss position, 12 months or more, unrealized losses	0	544
Securities in a continuous unrealized loss position, fair value	17,331	81,834
Securities in a continuous unrealized loss position, unrealized losses	96	4,467
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value	19,766
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses	92
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value	9,232
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses	52
Held to maturity securities in a continuous unrealized loss position, fair value	28,998
Held to maturity securities in a continuous unrealized loss position, unrealized losses	144
Collateralized Mortgage Backed Securities [Member]
Note 3 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Securities in a continuous unrealized loss position, less than 12 months, fair value	3,997	1,450
Securities in a continuous unrealized loss position, less than 12 months, unrealized losses	2	41
Securities in a continuous unrealized loss position, 12 months or more, fair value	1,069	1,123
Securities in a continuous unrealized loss position, 12 months or more, unrealized losses	31	70
Securities in a continuous unrealized loss position, fair value	5,066	2,573
Securities in a continuous unrealized loss position, unrealized losses	33	111
US States and Political Subdivisions Debt Securities [Member]
Note 3 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Securities in a continuous unrealized loss position, less than 12 months, fair value	1,298	5,108
Securities in a continuous unrealized loss position, less than 12 months, unrealized losses	10	162
Securities in a continuous unrealized loss position, 12 months or more, fair value	1,395	0
Securities in a continuous unrealized loss position, 12 months or more, unrealized losses	30	0
Securities in a continuous unrealized loss position, fair value	2,693	5,108
Securities in a continuous unrealized loss position, unrealized losses	40	162
Corporate Debt Securities [Member]
Note 3 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Securities in a continuous unrealized loss position, less than 12 months, fair value	4,880
Securities in a continuous unrealized loss position, less than 12 months, unrealized losses	34
Securities in a continuous unrealized loss position, 12 months or more, fair value	0
Securities in a continuous unrealized loss position, 12 months or more, unrealized losses	0
Securities in a continuous unrealized loss position, fair value	4,880
Securities in a continuous unrealized loss position, unrealized losses	34
Collateralized Debt Obligations [Member]
Note 3 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Securities in a continuous unrealized loss position, less than 12 months, fair value	0	0
Securities in a continuous unrealized loss position, less than 12 months, unrealized losses	0	0
Securities in a continuous unrealized loss position, 12 months or more, fair value	3,193	2,850
Securities in a continuous unrealized loss position, 12 months or more, unrealized losses	2,068	2,427
Securities in a continuous unrealized loss position, fair value	3,193	2,850
Securities in a continuous unrealized loss position, unrealized losses	$ 2,068	$ 2,427