Note 6 - Premises and Equipment (Details) - Summary of Premises and Equipment - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 70,951	$ 69,282
Accumulated depreciation and amortization	(31,394)	(30,194)
Total premises and equipment	39,557	39,088
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	7,118	6,733
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	44,959	43,818
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	18,497	18,426
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 377	$ 305