Note 7 - Premises and Equipment (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Depreciation, Total	$ 5,400	$ 4,600	$ 3,500
Property, Plant and Equipment, Gross, Ending Balance	115,028	97,189
Construction in Progress Land Purchased	$ 2,700
Number of Specific Store Locations	7
Cost of Completion	$ 8,000
Construction in Progress [Member]
Property, Plant and Equipment, Gross, Ending Balance	$ 8,041	$ 4,961