Note 9 - Loans - Nonaccrual Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Loans with no related allowance, unpaid principal balance	$ 89,455	$ 74,673
Loans with no related allowance, recorded investment	68,075	54,140
Loans with related allowance, unpaid principal balance		16,539
Loans with related allowance, recorded investment		14,714
Allowance	4,221	3,941
Unpaid principal balance	98,710	91,212
Non-accrual loans	77,330	68,854
Commercial Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	26,116	27,341
Loans with no related allowance, recorded investment	14,661	12,949
Loans with related allowance, unpaid principal balance		14,643
Loans with related allowance, recorded investment		12,823
Allowance		3,734
Commercial Real Estate Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	42,020	37,697
Loans with no related allowance, recorded investment	32,539	32,205
Loans with related allowance, unpaid principal balance		1,896
Loans with related allowance, recorded investment		1,891
Allowance		207
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	13,582	9,626
Loans with no related allowance, recorded investment	13,138	8,978
Real Estate Construction Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	7,737
Loans with no related allowance, recorded investment	7,737
Loans with related allowance, unpaid principal balance	9,255
Loans with related allowance, recorded investment	9,255
Allowance	$ 4,221
Installment and Other Loans [Member ]
Loans with no related allowance, unpaid principal balance		9
Loans with no related allowance, recorded investment		$ 8