Note 3 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Securities available for sale, amortized cost, due in one year or less	$ 61,814
Securities available for sale, fair value, due in one year or less	60,386
Securities held to maturity, amortized cost, due in one year or less	0
Securities held to maturity, fair value, due in one year or less	0
Due after one year through five years	142,008
Due after one year through five years	133,181
Due after one year through five years	0
Due after one year through five years	0
Securities available for sale, amortized cost, due after one year through five years	47,965
Securities available for sale, fair value, due after one year through five years	44,223
Securities held to maturity, amortized cost, due after one year through five years	2,000
Securities held to maturity, fair value, due after one year through five years	1,299
Due after ten years	72,741
Due after ten years	63,090
Due after ten years	5,000
Due after ten years	3,195
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	324,528
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	300,880
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date	7,000
Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value	4,494
Mortgage-backed securities and CMO	122,961
Mortgage-backed securities and CMO	113,421
Mortgage-backed securities and CMO	0
Mortgage-backed securities and CMO	0
Debt Securities, Available-for-Sale, Amortized Cost	447,489	$ 468,549
Debt Securities, Available-for-Sale	414,301	437,271
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	7,000	7,000
Debt Securities, Held-to-Maturity, Fair Value	$ 4,494	$ 4,446