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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016		Dec. 31, 2015
Other Real Estate Owned	$ 3,562	$ 4,274	$ 3,562	$ 4,274	$ 3,794	[1]	$ 5,237
Net loss on sales				91
Provision for unrealized losses			380
Operating expenses	28	25	66	72
Total Other Real Estate Owned	28	$ 25	446	$ 163
Residential Lots [Member]
Other Real Estate Owned	1,978		1,978		2,234
Residential Development [Member]
Other Real Estate Owned	22		22		423
Residential Single-family Homes [Member]
Other Real Estate Owned	1,024		1,024
Commercial Lots [Member]
Other Real Estate Owned	90		90		90
Commercial Buildings [Member]
Other Real Estate Owned	$ 448		$ 448		$ 1,047

[1] Derived from consolidated audited financial statements.