Note 5 - Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Due in one year or less	$ 1,479
Due in one year or less	1,503
Due after one year through five years	111,131
Due after one year through five years	111,296
Due after give years through ten years	29,596
Due after give years through ten years	29,843
Due after ten years	126,658
Due after ten years	127,327
No maturity	189
No maturity	125
Total securities available for sale	269,053
Securities available for sale	270,094	$ 236,131
Due in one year or less	1,162
Due in one year or less	1,162
Due after one year through five years	17,347
Due after one year through five years	18,500
Due after give years through ten years	19,806
Due after give years through ten years	20,951
Due after ten years	106,349
Due after ten years	110,640
Total securities held to maturity	144,664	152,028
Total securities held to maturity	$ 151,253	$ 158,032