Note 5 - Other Real Estate Owned - Classification of Other Real Estate Owned and Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017		Dec. 31, 2016
Other Real Estate Owned	$ 3,196	$ 3,562	$ 3,196	$ 3,562	$ 3,249	[1]	$ 3,794
Provision for unrealized losses	2		160	380
Operating expenses	44	28	249	66
Total Other Real Estate Owned	46	$ 28	409	$ 446
Residential Lots [Member]
Other Real Estate Owned	1,243		1,243		1,745
Residential Development [Member]
Other Real Estate Owned	366		366
Residential Real Estate [Member]
Other Real Estate Owned	1,197		1,197		1,024
Commercial Lots [Member]
Other Real Estate Owned					90
Commercial Buildings [Member]
Other Real Estate Owned	$ 390		$ 390		$ 390

[1] Derived from consolidated audited financial statements.