Note 2 - Securities (Details) - Securities in a Continuous Loss Position - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Note 2 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities available for sale, continuous unrealized loss position, less than 12 months	$ 17,825,000	$ 190,579,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	127,000	740,000
Securities available for sale, continuous unrealized loss position, 12 months or more	96,710,000	74,120,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss	2,216,000	2,836,000
Securities available for sale, continuous unrealized loss position	114,535,000	264,699,000
Securities available for sale, continuous unrealized loss position, unrealized loss	2,343,000	3,576,000
US Government Agencies Debt Securities [Member]
Note 2 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities available for sale, continuous unrealized loss position, less than 12 months	0	81,891,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	0	202,000
Securities available for sale, continuous unrealized loss position, 12 months or more	70,896,000	74,120,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss	1,957,000	2,836,000
Securities available for sale, continuous unrealized loss position	70,896,000	156,011,000
Securities available for sale, continuous unrealized loss position, unrealized loss	1,957,000	3,038,000
Collateralized Mortgage Backed Securities [Member]
Note 2 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities available for sale, continuous unrealized loss position, less than 12 months	6,831,000	49,940,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	37,000	218,000
Securities available for sale, continuous unrealized loss position, 12 months or more	19,943,000	0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss	114,000	0
Securities available for sale, continuous unrealized loss position	26,774,000	49,940,000
Securities available for sale, continuous unrealized loss position, unrealized loss	151,000	218,000
Municipal General Obligation Bonds [Member]
Note 2 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities available for sale, continuous unrealized loss position, less than 12 months	10,994,000	54,104,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	90,000	307,000
Securities available for sale, continuous unrealized loss position, 12 months or more	5,064,000	0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss	144,000	0
Securities available for sale, continuous unrealized loss position	16,058,000	54,104,000
Securities available for sale, continuous unrealized loss position, unrealized loss	234,000	307,000
Municipal Revenue Bonds [Member]
Note 2 - 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	807,000	0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss	1,000	0
Securities available for sale, continuous unrealized loss position	807,000	4,644,000
Securities available for sale, continuous unrealized loss position, unrealized loss	1,000	13,000
Other Debt Obligations [Member]
Note 2 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities available for sale, continuous unrealized loss position, less than 12 months	0	0
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	0	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	0	0
Securities available for sale, continuous unrealized loss position, unrealized loss	$ 0	$ 0