Note 3 - Securities (Details) - Securities in a Continuous Loss Position - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Note 3 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities available for sale, continuous unrealized loss position, less than 12 months	$ 19,466,000	$ 190,579,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	213,000	740,000
Securities available for sale, continuous unrealized loss position, 12 months or more	162,950,000	74,120,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss	3,012,000	2,836,000
Securities available for sale, continuous unrealized loss position	182,416,000	264,699,000
Securities available for sale, continuous unrealized loss position, unrealized loss	3,225,000	3,576,000
US Government Agencies Debt Securities [Member]
Note 3 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities available for sale, continuous unrealized loss position, less than 12 months	2,986,000	81,891,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	13,000	202,000
Securities available for sale, continuous unrealized loss position, 12 months or more	74,876,000	74,120,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss	2,323,000	2,836,000
Securities available for sale, continuous unrealized loss position	77,862,000	156,011,000
Securities available for sale, continuous unrealized loss position, unrealized loss	2,336,000	3,038,000
Collateralized Mortgage Backed Securities [Member]
Note 3 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities available for sale, continuous unrealized loss position, less than 12 months	6,048,000	49,940,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	33,000	218,000
Securities available for sale, continuous unrealized loss position, 12 months or more	19,822,000	0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss	227,000	0
Securities available for sale, continuous unrealized loss position	25,870,000	49,940,000
Securities available for sale, continuous unrealized loss position, unrealized loss	260,000	218,000
Municipal General Obligation Bonds [Member]
Note 3 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities available for sale, continuous unrealized loss position, less than 12 months	9,001,000	54,104,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	164,000	307,000
Securities available for sale, continuous unrealized loss position, 12 months or more	65,947,000	0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss	458,000	0
Securities available for sale, continuous unrealized loss position	74,948,000	54,104,000
Securities available for sale, continuous unrealized loss position, unrealized loss	622,000	307,000
Municipal Revenue Bonds [Member]
Note 3 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities available for sale, continuous unrealized loss position, less than 12 months	0	4,644,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	0	13,000
Securities available for sale, continuous unrealized loss position, 12 months or more	2,305,000	0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss	4,000	0
Securities available for sale, continuous unrealized loss position	2,305,000	4,644,000
Securities available for sale, continuous unrealized loss position, unrealized loss	4,000	13,000
Other Debt Obligations [Member]
Note 3 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities available for sale, continuous unrealized loss position, less than 12 months	1,431,000	0
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	3,000	0
Securities available for sale, continuous unrealized loss position, 12 months or more	0	0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss	0	0
Securities available for sale, continuous unrealized loss position	1,431,000	0
Securities available for sale, continuous unrealized loss position, unrealized loss	$ 3,000	$ 0