Note 4 - Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Within one year	$ 45,990
Within one year	$ 45,990
Within one year	0.61%
Due from one year to five years	$ 20,734
Due from one year to five years	$ 20,882
Due from one year to five years	1.91%
Due from five years to ten years	$ 17,333
Due from five years to ten years	$ 17,697
Due from five years to ten years	2.82%
Due after ten years	$ 24,606
Due after ten years	$ 24,900
Due after ten years	3.12%
	$ 108,663
	$ 109,469
	1.79%
Residential mortgage-backed securities	$ 74,813
Residential mortgage-backed securities	$ 75,674
Residential mortgage-backed securities	2.29%
Total	$ 183,476
Available-for-sale Securities	$ 185,143	$ 198,585
Total	1.99%