Note 4 - Securities (Details) - The Amortized Cost and Estimated Fair Value of Available-for-Sale and Held-to-Maturity Securities - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Amounts maturing in:
One year or less	$ 4,455
One year or less	4,464
One year through five years	64,660
One year through five years	64,920
One year through five years	1,530
One year through five years	1,574
Five years through ten years	46,566
Five years through ten years	47,647
Five years through ten years	16,465
Five years through ten years	17,080
After ten years	56,857
After ten years	57,220
After ten years	17,362
After ten years	17,800
Total	172,538
Total	174,251	$ 159,030
Total	35,357
Total	$ 36,454