Note 11 - Borrowings - Federal Home Loan Bank Advances (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Amount	$ 105,300,000	$ 94,300,000
Weighted average rate	2.69%	1.97%
Federal Home Loan Bank Advances Maturing in 2019 [Member]
Amount	$ 105,300,000	$ 92,200,000
Weighted average rate	2.69%	1.90%
Federal Home Loan Bank Advances Maturing in 2020 [Member]
Amount		$ 2,100,000
Weighted average rate	0.00%	4.87%
Federal Home Loan Bank Advances Maturing in 2021 [Member]
Amount
Weighted average rate	0.00%	0.00%