Note 6 - Securities (Details) - Available-for-sale Securities With Unrealized Loss Positions - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Note 6 - Securities (Details) - Available-for-sale Securities With Unrealized Loss Positions [Line Items]
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	$ 126,201	$ 75,084
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(970)	(716)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	79,344	105,227
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(1,783)	(2,536)
Available-for-sale securities with unrealized loss positions, fair value	205,545	180,311
Available-for-sale securities with unrealized loss positions, unrealized losses	(2,753)	(3,252)
US Government Agencies Debt Securities [Member]
Note 6 - Securities (Details) - Available-for-sale Securities With Unrealized Loss Positions [Line Items]
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	10,033	0
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(62)	0
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	14,180	24,020
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(295)	(583)
Available-for-sale securities with unrealized loss positions, fair value	24,213	24,020
Available-for-sale securities with unrealized loss positions, unrealized losses	(357)	(583)
Obligations of States and Political Subdivisions, Tax-exempt [Member]
Note 6 - Securities (Details) - Available-for-sale Securities With Unrealized Loss Positions [Line Items]
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	24,310	11,898
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(283)	(289)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	744	6,991
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(23)	(92)
Available-for-sale securities with unrealized loss positions, fair value	25,054	18,889
Available-for-sale securities with unrealized loss positions, unrealized losses	(306)	(381)
Obligations of States and Political Subdivisions, Taxable [Member]
Note 6 - Securities (Details) - Available-for-sale Securities With Unrealized Loss Positions [Line Items]
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	9,581	4,240
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(61)	(22)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	4,777	9,159
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(70)	(152)
Available-for-sale securities with unrealized loss positions, fair value	14,358	13,399
Available-for-sale securities with unrealized loss positions, unrealized losses	(131)	(174)
Collateralized Mortgage Backed Securities [Member]
Note 6 - Securities (Details) - Available-for-sale Securities With Unrealized Loss Positions [Line Items]
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	20,022	0
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(213)	0
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	3,889	4,160
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(74)	(69)
Available-for-sale securities with unrealized loss positions, fair value	23,911	4,160
Available-for-sale securities with unrealized loss positions, unrealized losses	(287)	(69)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 6 - Securities (Details) - Available-for-sale Securities With Unrealized Loss Positions [Line Items]
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	62,196	58,812
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(341)	(396)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	55,754	60,897
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(1,321)	(1,640)
Available-for-sale securities with unrealized loss positions, fair value	117,950	119,709
Available-for-sale securities with unrealized loss positions, unrealized losses	(1,662)	(2,036)
Debt Securities [Member]
Note 6 - Securities (Details) - Available-for-sale Securities With Unrealized Loss Positions [Line Items]
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	126,142	74,950
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(960)	(707)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	79,344	105,227
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(1,783)	(2,536)
Available-for-sale securities with unrealized loss positions, fair value	205,486	180,177
Available-for-sale securities with unrealized loss positions, unrealized losses	(2,743)	(3,243)
Equity Securities [Member]
Note 6 - Securities (Details) - Available-for-sale Securities With Unrealized Loss Positions [Line Items]
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	59	134
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(10)	(9)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	0	0
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	0	0
Available-for-sale securities with unrealized loss positions, fair value	59	134
Available-for-sale securities with unrealized loss positions, unrealized losses	$ (10)	$ (9)