Note 11 - Fair Values (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale, Total	$ 605,661,000	$ 592,743,000
Mortgages Held-for-sale, Fair Value Disclosure	$ 15,200,000	16,700,000
Real Estate Dependent Loans and Foreclosed Assets Estimated Selling Costs [Member]
Fair Value Inputs, Discount Factor	10.00%
Real Estate Dependent Loans and Foreclosed Assets [Member] | Commercial Real Estate [Member] | Minimum [Member]
Fair Value Inputs, Discount Factor	15.00%
Real Estate Dependent Loans and Foreclosed Assets [Member] | Commercial Real Estate [Member] | Maximum [Member]
Fair Value Inputs, Discount Factor	25.00%
Real Estate Dependent Loans and Foreclosed Assets [Member] | Residential Real Estate [Member] | Minimum [Member]
Fair Value Inputs, Discount Factor	25.00%
Real Estate Dependent Loans and Foreclosed Assets [Member] | Residential Real Estate [Member] | Maximum [Member]
Fair Value Inputs, Discount Factor	50.00%
Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale, Total	$ 0	0
Available-for-Sale Securities [Member]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance	$ 0	$ 0