Note 9 - Other Borrowings - Long-term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Federal Home Loan Bank advances	$ 3,479	$ 18,646
Federal Home Loan Bank advances, average rate	3.27%	3.97%
Subordinated notes payable	$ 33,506	$ 33,506
Subordinated notes payable, average rate	2.85%	2.30%
Total FHLB advances and subordinated notes payable	$ 36,985	$ 52,152
Total FHLB advances and subordinated notes payable, average rate	2.89%	2.89%