Note 4 - Premises and Equipment, Net - Summary of Premises and Equipment (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Land and Land Improvements [Member]
Property, plant and equipment, gross	$ 16,634,000	$ 16,529,000
Building [Member]
Property, plant and equipment, gross	39,510,000	39,394,000
Furniture and Fixtures [Member]
Property, plant and equipment, gross	17,089,000	16,978,000
Property, plant and equipment, gross	73,233,000	72,901,000
Less: accumulated depreciation	28,021,000	26,039,000
Premises and equipment, net	$ 45,212,000	$ 46,862,000