Note 8 - Office Properties and Equipment - Components of Properties and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Office properties and equipment, gross	$ 71,006	$ 72,303
Accumulated depreciation	(20,460)	(18,254)
Office properties and equipment—net	50,546	54,049
Land and Land Improvements [Member]
Office properties and equipment, gross	10,583	10,896
Building and Building Improvements [Member]
Office properties and equipment, gross	46,945	48,059
Furniture and Fixtures [Member]
Office properties and equipment, gross	13,256	13,126
Automobiles and Other [Member]
Office properties and equipment, gross	$ 222	$ 222