Note 3 - Securities (Details) - Securities in a Continuous Loss Position (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Note 3 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities in a continuous loss position, less than 12 months, fair value	$ 8,636	$ 202,015
Securities in a continuous loss position, less than 12 months, unrealized loss	67	27,059
Securities in a continuous loss position, 12 months or more, fair value	178,042	18,493
Securities in a continuous loss position, 12 months or more, unrealized loss	5,490	3,702
US Government Agencies Debt Securities [Member]
Note 3 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities in a continuous loss position, less than 12 months, fair value	6,964	138,324
Securities in a continuous loss position, less than 12 months, unrealized loss	30	20,400
Securities in a continuous loss position, 12 months or more, fair value	156,149	15,796
Securities in a continuous loss position, 12 months or more, unrealized loss	4,709	3,211
US States and Political Subdivisions Debt Securities [Member]
Note 3 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities in a continuous loss position, less than 12 months, fair value	1,222	58,013
Securities in a continuous loss position, less than 12 months, unrealized loss	35	6,131
Securities in a continuous loss position, 12 months or more, fair value	19,818	2,697
Securities in a continuous loss position, 12 months or more, unrealized loss	692	491
Corporate Debt Securities [Member]
Note 3 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities in a continuous loss position, less than 12 months, fair value	450	5,511
Securities in a continuous loss position, less than 12 months, unrealized loss	2	506
Securities in a continuous loss position, 12 months or more, fair value	1,948
Securities in a continuous loss position, 12 months or more, unrealized loss	27
Other Debt Obligations [Member]
Note 3 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities in a continuous loss position, less than 12 months, fair value		167
Securities in a continuous loss position, less than 12 months, unrealized loss		22
Securities in a continuous loss position, 12 months or more, fair value	127
Securities in a continuous loss position, 12 months or more, unrealized loss	$ 62