Note 13 - Commitments, Contingencies and Concentrations of Credit Risk - Summary of Off-balance Sheet Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fixed Income Interest Rate [Member]
Off-balance sheet risk	$ 125,416	$ 157,559
Variable Income Interest Rate [Member]
Off-balance sheet risk	1,052,226	1,009,420
Commitments to Extend Credit [Member] | Fixed Income Interest Rate [Member]
Off-balance sheet risk	100,430	96,690
Commitments to Extend Credit [Member] | Variable Income Interest Rate [Member]
Off-balance sheet risk	647,652	626,538
Home Equity Line of Credit [Member] | Fixed Income Interest Rate [Member]
Off-balance sheet risk	17	22
Home Equity Line of Credit [Member] | Variable Income Interest Rate [Member]
Off-balance sheet risk	41,349	48,764
Outstanding Commercial Mortgage Loan Commitments [Member] | Fixed Income Interest Rate [Member]
Off-balance sheet risk	24,139	60,039
Outstanding Commercial Mortgage Loan Commitments [Member] | Variable Income Interest Rate [Member]
Off-balance sheet risk	321,771	310,535
Standby Letters of Credit [Member] | Fixed Income Interest Rate [Member]
Off-balance sheet risk	190	163
Standby Letters of Credit [Member] | Variable Income Interest Rate [Member]
Off-balance sheet risk	41,276	23,399
Overdraft Protection Lines [Member] | Fixed Income Interest Rate [Member]
Off-balance sheet risk	640	645
Overdraft Protection Lines [Member] | Variable Income Interest Rate [Member]
Off-balance sheet risk	$ 178	$ 184