Note 3 - Investment Securities Available for Sale (Detail) - Maturities of Debt Securities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Within one year	$ 276
Within one year	276
Within one year	3.37%
Due from one year to five years	19,539
Due from one year to five years	19,636
Due from one year to five years	2.17%
Due from five years to ten years	19,504
Due from five years to ten years	19,838
Due from five years to ten years	2.73%
Due after ten years	11,321
Due after ten years	11,578
Due after ten years	3.78%
Total	50,640	52,562
Total	$ 51,328
Total	2.75%