Note 5 - Securities (Details) - The Amortized Cost and Estimated Fair Value of Available-for-sale and Held-to-maturity Securities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Amounts maturing in:
One year or less	$ 3,328
One year or less	3,330
One year through five years	57,795
One year through five years	58,605
One year through five years	1,489
One year through five years	1,508
Five years through ten years	41,652
Five years through ten years	42,536
Five years through ten years	15,476
Five years through ten years	15,878
After ten years	60,991
After ten years	62,419
After ten years	19,644
After ten years	19,839
Total	163,766
Total	166,890	186,986
Total	36,609
Total	$ 37,225