Note 3 - Investment Securities (Details) - The Amortized Cost and Estimated Fair Value of the Securities Portfolio by Contractual Maturity (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
The Amortized Cost and Estimated Fair Value of the Securities Portfolio by Contractual Maturity [Abstract]
Due in one year or less	$ 7,951
Due in one year or less	7,970
Due in one year or less	0
Due in one year or less	0
Due after one year through five years	144,282
Due after one year through five years	144,933
Due after one year through five years	0
Due after one year through five years	0
Due after five years through ten years	82,454
Due after five years through ten years	82,996
Due after five years through ten years	705
Due after five years through ten years	799
Due after ten years	15,609
Due after ten years	15,622
Due after ten years	3,023
Due after ten years	3,124
Mortgage-backed securities	366,244
Mortgage-backed securities	373,001
Mortgage-backed securities	0
Mortgage-backed securities	0
Total	616,540
Total	624,522
Total	3,728	765
Total	$ 3,923	$ 827