Note 6 - Bank Premises and Equipment (Details Textual) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Depreciation, Total		$ 2.3	$ 2.2	$ 1.9
Loan Transferred From Loans to Foreclosed Assets, Held-For-Sale to Bank Premises	$ 1.0
Building [Member]
Property, Plant and Equipment, Useful Life (Year)		40 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		7 years