Note 6 - Premises and Equipment (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Depreciation, Total		$ 766	$ 805	$ 801
Operating Leases, Future Minimum Payments Due, Next Twelve Months		346
Operating Leases, Future Minimum Payments, Due in Two Years		192
Operating Leases, Future Minimum Payments, Due in Three Years		172
Operating Leases, Future Minimum Payments, Due in Four Years		175
Operating Leases, Future Minimum Payments, Due in Five Years		177
Operating Leases, Future Minimum Payments, Due Thereafter		$ 872
Marion Branch Office [Member]
Gain (Loss) on Disposition of Property Plant Equipment, Total	$ 134