Note 7 - Premises and Equipment (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Depreciation, Total	$ 6,500	$ 5,400	$ 4,600
Property, Plant and Equipment, Gross, Ending Balance	150,601	115,028
Construction in Progress Land Purchased	$ 5,700
Number of Specific Store Locations	5
Cost of Completion	$ 5,300
Construction in Progress [Member]
Property, Plant and Equipment, Gross, Ending Balance	$ 13,728	$ 8,041