Note 3 - Securities (Details) - Securities by Contractual Maturity - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Securities by Contractual Maturity [Abstract]
Due in one year or less	$ 261
Due in one year or less	268
Due in over one to five years	6,565
Due in over one to five years	6,907
Due in over one to five years	8,009
Due in over one to five years	7,994
Due in over five to ten years	10,593
Due in over five to ten years	11,243
Due after ten years	2,082
Due after ten years	2,104
Agency mortgage-backed securities, residential	78,569
Agency mortgage-backed securities, residential	79,985
Agency mortgage-backed securities, residential	5
Agency mortgage-backed securities, residential	5
Total debt securities	86,578
Total debt securities	87,979
Total debt securities	19,506	$ 19,903
Total debt securities	$ 20,527	$ 20,790