Note 10 - Fair Value of Financial Instruments - Assets Measured on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets measured on a nonrecurring basis	$ 17,893	$ 20,176
Fair Value, Inputs, Level 1 [Member]
Assets measured on a nonrecurring basis	0	0
Fair Value, Inputs, Level 2 [Member]
Assets measured on a nonrecurring basis	0	0
Fair Value, Inputs, Level 3 [Member]
Assets measured on a nonrecurring basis	17,893	20,176
Impaired Loans [Member]
Assets measured on a nonrecurring basis	16,440	18,749
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured on a nonrecurring basis	0	0
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured on a nonrecurring basis	0	0
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured on a nonrecurring basis	16,440	18,749
Other Nonperforming Assets [Member]
Assets measured on a nonrecurring basis	1,453	1,427
Other Nonperforming Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured on a nonrecurring basis	0	0
Other Nonperforming Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured on a nonrecurring basis	0	0
Other Nonperforming Assets [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured on a nonrecurring basis	$ 1,453	$ 1,427