Note 5 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Note 5 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value	$ 63,456	$ 27,506
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses	1,487	142
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value	4,409	5,657
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses	1,695	2,129
Available for sale securities in a continuous unrealized loss position, fair value	67,865	33,163
Available for sale securities in a continuous unrealized loss position, unrealized losses	3,182	2,271
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value	36,122	19,766
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses	515	92
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value	0	9,232
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses	0	52
Held to maturity securities in a continuous unrealized loss position, fair value	36,122	28,998
Held to maturity securities in a continuous unrealized loss position, unrealized losses	515	144
Collateralized Mortgage Obligations [Member]
Note 5 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value	39,623	17,331
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses	918	96
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value	0	0
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses	0	0
Available for sale securities in a continuous unrealized loss position, fair value	39,623	17,331
Available for sale securities in a continuous unrealized loss position, unrealized losses	918	96
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value	28,989	19,766
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses	444	92
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value	0	9,232
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses	0	52
Held to maturity securities in a continuous unrealized loss position, fair value	28,989	28,998
Held to maturity securities in a continuous unrealized loss position, unrealized losses	444	144
Collateralized Mortgage Backed Securities [Member]
Note 5 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value	6,113	3,997
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses	43	2
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value	1,022	1,069
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses	31	31
Available for sale securities in a continuous unrealized loss position, fair value	7,135	5,066
Available for sale securities in a continuous unrealized loss position, unrealized losses	74	33
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value	2,897
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses	25
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value	0
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses	0
Held to maturity securities in a continuous unrealized loss position, fair value	2,897
Held to maturity securities in a continuous unrealized loss position, unrealized losses	25
US States and Political Subdivisions Debt Securities [Member]
Note 5 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value	8,175	1,298
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses	193	10
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value	1,381	1,395
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses	44	30
Available for sale securities in a continuous unrealized loss position, fair value	9,556	2,693
Available for sale securities in a continuous unrealized loss position, unrealized losses	237	40
Corporate Debt Securities [Member]
Note 5 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value	9,545	4,880
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses	333	34
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value	0	0
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses	0	0
Available for sale securities in a continuous unrealized loss position, fair value	9,545	4,880
Available for sale securities in a continuous unrealized loss position, unrealized losses	333	34
Collateralized Debt Obligations [Member]
Note 5 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value	0	0
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses	0	0
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value	2,006	3,193
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses	1,620	2,068
Available for sale securities in a continuous unrealized loss position, fair value	2,006	3,193
Available for sale securities in a continuous unrealized loss position, unrealized losses	1,620	$ 2,068
US Government Agencies Debt Securities [Member]
Note 5 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value	4,236
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses	46
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value	0
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses	0
Held to maturity securities in a continuous unrealized loss position, fair value	4,236
Held to maturity securities in a continuous unrealized loss position, unrealized losses	$ 46