Note 6 - Premises and Equipment (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment, Gross, Ending Balance	$ 80,234	$ 75,049
Depreciation, Total	3,700	3,500	$ 3,200
Land [Member]
Property, Plant and Equipment, Gross, Ending Balance	9,664	8,908
Land [Member] | Previously Reported [Member]
Property, Plant and Equipment, Gross, Ending Balance		7,118
Building and Building Improvements [Member]
Property, Plant and Equipment, Gross, Ending Balance	47,726	45,285
Building and Building Improvements [Member] | Previously Reported [Member]
Property, Plant and Equipment, Gross, Ending Balance		47,924
Furniture and Equipment [Member]
Property, Plant and Equipment, Gross, Ending Balance	$ 21,793	19,360
Furniture and Equipment [Member] | Previously Reported [Member]
Property, Plant and Equipment, Gross, Ending Balance		$ 18,511