Note 4 - Loans and Allowance for Credit Losses (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Financing Receivable, Nonaccrual, Interest Income	$ 0	$ 0	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts	0	0	0	0
Financing Receivable, Accrued Interest, after Allowance for Credit Loss	$ 2,000		$ 2,000		$ 1,900
Nonperforming Financial Instruments [Member]
Financing Receivable, Nonaccrual, Interest Income					38
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual	$ 0		$ 0		$ 2,400
Financing Receivable, Number of Loans, Nonaccrual Status					3