Note 6 - Premises and Equipment - Summary of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, plant and equipment, gross	$ 75,325	$ 70,951
Accumulated depreciation and amortization	(32,941)	(31,394)
Total premises and equipment	42,384	39,557
Land [Member]
Property, plant and equipment, gross	7,118	7,118
Building and Building Improvements [Member]
Property, plant and equipment, gross	47,398	44,959
Furniture and Equipment [Member]
Property, plant and equipment, gross	20,758	18,497
Construction in Progress [Member]
Property, plant and equipment, gross	$ 51	$ 377