Note 6 - Premises and Equipment (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Depreciation		$ 805	$ 801	$ 749
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 292	292
Operating Leases, Future Minimum Payments, Due in Two Years	233	233
Operating Leases, Future Minimum Payments, Due in Three Years	56	56
Operating Leases, Future Minimum Payments, Due in Four Years	34	34
Operating Leases, Future Minimum Payments, Due in Five Years	34	34
Operating Leases, Future Minimum Payments, Due Thereafter	130	$ 130
Marion Branch Office [Member]
Gain (Loss) on Disposition of Property Plant Equipment	$ 134