Note 4 - Securities - The Amortized Cost and Estimated Fair Value of Available-for-Sale and Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
One year or less	$ 5,606
One year or less	5,629
One year through five years	57,722
One year through five years	58,304
One year through five years	1,543
One year through five years	1,589
Five years through ten years	36,167
Five years through ten years	37,421
Five years through ten years	16,514
Five years through ten years	17,325
One year or lessAfter ten years	55,788
After ten years	56,552
After ten years	17,358
After ten years	18,214
Total	155,283
Total	157,906	$ 159,030
Total	35,415
Total	$ 37,128