Note 4 - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Due in one year or less	$ 4,002
Due in one year or less	4,003
Due in one year or less	395
Due in one year or less	398
Due in over one to five years	6,625
Due in over one to five years	6,633
Due in over one to five years	7,160
Due in over one to five years	7,540
Due in over five to ten years
Due in over five to ten years
Due in over five to ten years	9,800
Due in over five to ten years	10,471
Due after ten years
Due after ten years
Due after ten years	2,291
Due after ten years	2,323
Agency mortgage-backed securities, residential	92,243
Agency mortgage-backed securities, residential	94,224
Agency mortgage-backed securities, residential	5
Agency mortgage-backed securities, residential	5
Total debt securities	102,870
Total debt securities	104,860
Total debt securities	19,651	$ 19,903
Securities held to maturity	$ 20,737	$ 20,790