Note 3 - Securities (Details) - Securities in a Continuous Loss Position (USD $)	Dec. 31, 2014	Dec. 31, 2013
Note 3 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities available for sale, continuous unrealized loss position, less than 12 months	$ 190,579,000	$ 58,767,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	740,000	5,833,000
Securities available for sale, continuous unrealized loss position, 12 months or more	74,120,000	29,679,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss	2,836,000	4,267,000
Securities available for sale, continuous unrealized loss position	264,699,000	88,446,000
Securities available for sale, continuous unrealized loss position, unrealized loss	3,576,000	10,100,000
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	81,891,000	57,117,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	202,000	5,798,000
Securities available for sale, continuous unrealized loss position, 12 months or more	74,120,000	29,679,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss	2,836,000	4,267,000
Securities available for sale, continuous unrealized loss position	156,011,000	86,796,000
Securities available for sale, continuous unrealized loss position, unrealized loss	3,038,000	10,065,000
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	49,940,000	0
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	218,000	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	49,940,000	0
Securities available for sale, continuous unrealized loss position, unrealized loss	218,000	0
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	54,104,000	295,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	307,000	4,000
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	54,104,000	295,000
Securities available for sale, continuous unrealized loss position, unrealized loss	307,000	4,000
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	4,644,000	0
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	13,000	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	4,644,000	0
Securities available for sale, continuous unrealized loss position, unrealized loss	13,000	0
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	0
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss	0
Securities available for sale, continuous unrealized loss position, 12 months or more	0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss	0
Securities available for sale, continuous unrealized loss position	0
Securities available for sale, continuous unrealized loss position, unrealized loss	0
Mutual Funds [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		1,355,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss		31,000
Securities available for sale, continuous unrealized loss position, 12 months or more		0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss		0
Securities available for sale, continuous unrealized loss position		1,355,000
Securities available for sale, continuous unrealized loss position, unrealized loss		$ 31,000