Note 5 - Loans - Impaired Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Loans with no related allowance, unpaid principal balance	$ 74,673	$ 46,336
Loans with no related allowance, recorded investment	54,140	38,401
Loans with related allowance, unpaid principal balance	16,539	38,272
Loans with related allowance, recorded investment	14,714	27,445
Allowance	3,941	4,547
Unpaid principal balance	91,212	84,608
Recorded investment	68,854	65,846
Commercial Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	27,341	15,879
Loans with no related allowance, recorded investment	12,949	11,342
Loans with related allowance, unpaid principal balance	14,643	14,294
Loans with related allowance, recorded investment	12,823	5,217
Allowance	3,734	894
Commercial Real Estate Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	37,697	24,437
Loans with no related allowance, recorded investment	32,205	21,209
Loans with related allowance, unpaid principal balance	1,896	17,930
Loans with related allowance, recorded investment	1,891	16,964
Allowance	207	3,631
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	9,626	6,020
Loans with no related allowance, recorded investment	8,978	5,850
Loans with related allowance, unpaid principal balance	0	6,048
Loans with related allowance, recorded investment	0	5,264
Allowance	0	$ 22
Installment and Other Loans [Member ]
Loans with no related allowance, unpaid principal balance	9
Loans with no related allowance, recorded investment	$ 8