Note 9 - Loans - Impaired Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Loans with no related allowance, unpaid principal balance	$ 89,224	$ 74,673
Loans with no related allowance, recorded investment	62,388	54,140
Loans with related allowance, unpaid principal balance	12,511	16,539
Loans with related allowance, recorded investment	11,192	14,714
Allowance	4,258	3,941
Unpaid principal balance	101,735	91,212
Recorded investment	73,580	68,854
Commercial Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	27,401	27,341
Loans with no related allowance, recorded investment	10,887	12,949
Loans with related allowance, unpaid principal balance	12,511	14,643
Loans with related allowance, recorded investment	11,192	12,823
Allowance	4,258	3,734
Commercial Real Estate Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	49,927	37,697
Loans with no related allowance, recorded investment	40,218	32,205
Loans with related allowance, unpaid principal balance	0	1,896
Loans with related allowance, recorded investment	0	1,891
Allowance	0	207
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	11,896	9,626
Loans with no related allowance, recorded investment	$ 11,283	8,978
Installment and Other Loans [Member ]
Loans with no related allowance, unpaid principal balance		9
Loans with no related allowance, recorded investment		$ 8