Note 5 - Allowance for Credit Losses - Summary of Modified Loans (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Commercial Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 498
Modified in Period, to Total Financing Receivables, Percentage	0.30%
Commercial Portfolio Segment [Member] | Principal Forgiveness [Member]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
Commercial Portfolio Segment [Member] | Payment Deferral [Member]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	498
Commercial Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Portfolio Segment [Member] | Extended Maturity and Payment Deferral [Member]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 498
Modified in Period, to Total Financing Receivables, Percentage	0.10%
Commercial Real Estate Portfolio Segment [Member] | Principal Forgiveness [Member]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	498
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity and Payment Deferral [Member]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0