Note 3 - Securities (Details) - Securities in a Continuous Loss Position - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Note 3 - Securities (Details) - Securities in a Continuous Loss Position [Line Items]
Securities in a continuous loss position, less than 12 months, fair value	$ 96,678	$ 8,636
Securities in a continuous loss position, less than 12 months, unrealized loss	2,116	67
Securities in a continuous loss position, 12 months or more, fair value	95,447	178,042
Securities in a continuous loss position, 12 months or more, unrealized loss	3,698	5,490
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	88,255	6,964
Securities in a continuous loss position, less than 12 months, unrealized loss	1,800	30
Securities in a continuous loss position, 12 months or more, fair value	84,959	156,149
Securities in a continuous loss position, 12 months or more, unrealized loss	3,329	4,709
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	3,449	1,222
Securities in a continuous loss position, less than 12 months, unrealized loss	24	35
Securities in a continuous loss position, 12 months or more, fair value	10,161	19,818
Securities in a continuous loss position, 12 months or more, unrealized loss	306	692
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	4,974	450
Securities in a continuous loss position, less than 12 months, unrealized loss	292	2
Securities in a continuous loss position, 12 months or more, fair value	200	1,948
Securities in a continuous loss position, 12 months or more, unrealized loss	1	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	0	0
Securities in a continuous loss position, less than 12 months, unrealized loss	0	0
Securities in a continuous loss position, 12 months or more, fair value	127	127
Securities in a continuous loss position, 12 months or more, unrealized loss	$ 62	$ 62