Note 4 - Loans - Troubled Debt Restructuring On Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Financing Receivable, Modified in Period, Amount	$ 1,570	$ 1,818
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modified in Period, Amount	$ 1,076	$ 1,793
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage	0.95%	1.47%
Commercial Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Modified in Period, Amount	$ 494
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage	0.23%
Residential Portfolio Segment [Member] | Secured By Senior Liens On 1-4 Family Dwellings [Member]
Financing Receivable, Modified in Period, Amount		$ 25
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage		0.01%
Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified in Period, Amount	$ 0	$ 0
Contractual Interest Rate Reduction [Member] | Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modified in Period, Amount	0	0
Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Modified in Period, Amount	0
Contractual Interest Rate Reduction [Member] | Residential Portfolio Segment [Member] | Secured By Senior Liens On 1-4 Family Dwellings [Member]
Financing Receivable, Modified in Period, Amount		0
Extended Maturity [Member]
Financing Receivable, Modified in Period, Amount	571	1,793
Extended Maturity [Member] | Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modified in Period, Amount	77	1,793
Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Modified in Period, Amount	494
Extended Maturity [Member] | Residential Portfolio Segment [Member] | Secured By Senior Liens On 1-4 Family Dwellings [Member]
Financing Receivable, Modified in Period, Amount		0
Principal Forgiveness [Member]
Financing Receivable, Modified in Period, Amount	0	0
Principal Forgiveness [Member] | Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modified in Period, Amount	0	0
Principal Forgiveness [Member] | Commercial Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Modified in Period, Amount	0
Principal Forgiveness [Member] | Residential Portfolio Segment [Member] | Secured By Senior Liens On 1-4 Family Dwellings [Member]
Financing Receivable, Modified in Period, Amount		0
Payment Deferral [Member]
Financing Receivable, Modified in Period, Amount	0	0
Payment Deferral [Member] | Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modified in Period, Amount	0	0
Payment Deferral [Member] | Commercial Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Modified in Period, Amount	0
Payment Deferral [Member] | Residential Portfolio Segment [Member] | Secured By Senior Liens On 1-4 Family Dwellings [Member]
Financing Receivable, Modified in Period, Amount		0
Extended Maturity and Payment Differential [Member]
Financing Receivable, Modified in Period, Amount	999	0
Extended Maturity and Payment Differential [Member] | Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modified in Period, Amount	999	0
Extended Maturity and Payment Differential [Member] | Commercial Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Modified in Period, Amount	0
Extended Maturity and Payment Differential [Member] | Residential Portfolio Segment [Member] | Secured By Senior Liens On 1-4 Family Dwellings [Member]
Financing Receivable, Modified in Period, Amount		0
Interest Rate Reduction and Payment Deferral [Member]
Financing Receivable, Modified in Period, Amount	0	25
Interest Rate Reduction and Payment Deferral [Member] | Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modified in Period, Amount	0	0
Interest Rate Reduction and Payment Deferral [Member] | Commercial Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Modified in Period, Amount	$ 0
Interest Rate Reduction and Payment Deferral [Member] | Residential Portfolio Segment [Member] | Secured By Senior Liens On 1-4 Family Dwellings [Member]
Financing Receivable, Modified in Period, Amount		$ 25