Note 7 - FHLB Advances - Summary of Scheduled Maturities of Fixed Term FHLB Advances (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Open line of credit	$ 6,750
Fixed rate advances, amount, 2018	18,500
Adjustable rate advances, amount, 2018	2,000
2018	20,500
Fixed rate advances, amount, 2019	2,750
Adjustable rate advances, amount, 2019	2,000
2019	4,750
Fixed rate advances, amount, 2020	2,000
Adjustable rate advances, amount, 2020	2,000
2020	4,000
Fixed rate advances, amount, 2021
Adjustable rate advances, amount, 2021	2,000
2021	2,000
Fixed rate advances, amount, Total	30,000
Adjustable rate advances, amount, Total	8,000
Total	$ 38,000	$ 12,750
Weighted Average [Member]
Open line of credit rate	2.12%
Fixed rate advances, weighted average rate, 2018	2.05%
Adjustable rate advances, weighted average rate, 2018	1.32%
Fixed rate advances, weighted average rate, 2019	1.78%
Adjustable rate advances, weighted average rate, 2019	1.51%
Fixed rate advances, weighted average rate, 2020	1.62%
Adjustable rate advances, weighted average rate, 2020	1.66%
Fixed rate advances, weighted average rate, 2021
Adjustable rate advances, weighted average rate, 2021	1.74%
Fixed rate, fixed term advances rate	2.01%
Adjustable rate advances, weighted average rate, Total	1.56%