Note 8 - Borrowings - Federal Home Loan Bank Advances (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Amount	$ 95,700,000	$ 52,100,000
Weighted average rate	1.72%	2.25%
Federal Home Loan Bank Advances Maturing in 2017 [Member]
Amount	$ 43,600,000
Weighted average rate	0.79%	0.00%
Federal Home Loan Bank Advances Maturing in 2018 [Member]
Amount	$ 50,000,000	$ 50,000,000
Weighted average rate	2.14%	2.14%
Federal Home Loan Bank Advances Maturing in 2019 [Member]
Amount	$ 2,100,000	$ 2,100,000
Weighted average rate	4.87%	4.87%