Note 7 - Amortized Cost and Estimated Fair Value of Debt Securities as Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Cost, within 1 year	$ 16,840	$ 11,161
Fair Value, within 1 year	16,882	11,190
Cost, 1 to 5 years	79,240	83,542
Fair Value, 1 to 5 years	79,940	84,028
Cost, 6 to 10 years	69,815	58,863
Fair Value, 6 to 10 years	69,409	58,872
Cost, over 10 years	2,588	4,076
Fair Value, over 10 years	2,593	4,183
Amortized Cost	168,483	157,642
Fair Value	$ 168,824	$ 158,273