Note 5 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position - USD ($) $ in Thousands	Sep. 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	$ 60,013	$ 27,506
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses	1,352	142
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value	8,088	5,657
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses	1,519	2,129
Available for sale securities in a continuous unrealized loss position, fair value	68,101	33,163
Available for sale securities in a continuous unrealized loss position, unrealized losses	2,871	2,271
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value	13,478	19,766
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses	245	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	13,478	28,998
Held to maturity securities in a continuous unrealized loss position, unrealized losses	245	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	23,084	17,331
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses	353	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	23,084	17,331
Available for sale securities in a continuous unrealized loss position, unrealized losses	353	96
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value	9,460	19,766
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses	206	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	9,460	28,998
Held to maturity securities in a continuous unrealized loss position, unrealized losses	206	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	5,815	3,997
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses	29	2
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value	1,010	1,069
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses	22	31
Available for sale securities in a continuous unrealized loss position, fair value	6,825	5,066
Available for sale securities in a continuous unrealized loss position, unrealized losses	51	33
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	1,412	1,298
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses	13	10
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value	5,408	1,395
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses	97	30
Available for sale securities in a continuous unrealized loss position, fair value	6,820	2,693
Available for sale securities in a continuous unrealized loss position, unrealized losses	110	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	12,488	4,880
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses	367	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	12,488	4,880
Available for sale securities in a continuous unrealized loss position, unrealized losses	367	34
Asset-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	17,214
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses	590
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value	0
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses	0
Available for sale securities in a continuous unrealized loss position, fair value	17,214
Available for sale securities in a continuous unrealized loss position, unrealized losses	590
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	1,670	3,193
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses	1,400	2,068
Available for sale securities in a continuous unrealized loss position, fair value	1,670	3,193
Available for sale securities in a continuous unrealized loss position, unrealized losses	1,400	$ 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	4,018
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses	39
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	4,018
Held to maturity securities in a continuous unrealized loss position, unrealized losses	$ 39