Note 2 - Investment Securities (Details Textual) $ in Thousands	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Debt Securities, Held-to-Maturity, Number of Securities	0
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	$ 0
Debt Securities, Held-to-Maturity, Nonaccrual	0	$ 0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss	4,000
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss		$ 5,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss	$ 0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	471	488
Debt Securities, Available-for-Sale, Unrealized Loss Position, Percentage	98.00%	86.00%
Collateral Pledged [Member]
Debt Securities, Available-for-Sale, Restricted	$ 881,000	$ 852,000