Note 5 - Debt Securities - Summary of Volume of state and Political Subdivision Securities Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Tax-exempt state and political subdivisions	$ 93,737	$ 94,227	[1]
Unrealized Gains	0	0
Unrealized Losses	6,708	5,908
Debt Securities, Held-to-maturity, Fair Value	87,029	$ 88,319	[1]
TEXAS
Tax-exempt state and political subdivisions	14,718
Unrealized Gains	0
Unrealized Losses	955
Debt Securities, Held-to-maturity, Fair Value	13,763
CALIFORNIA
Tax-exempt state and political subdivisions	9,396
Unrealized Gains	0
Unrealized Losses	521
Debt Securities, Held-to-maturity, Fair Value	8,875
PENNSYLVANIA
Tax-exempt state and political subdivisions	8,282
Unrealized Gains	0
Unrealized Losses	493
Debt Securities, Held-to-maturity, Fair Value	7,789
FLORIDA
Tax-exempt state and political subdivisions	7,297
Unrealized Gains	0
Unrealized Losses	710
Debt Securities, Held-to-maturity, Fair Value	6,587
MICHIGAN
Tax-exempt state and political subdivisions	6,739
Unrealized Gains	0
Unrealized Losses	561
Debt Securities, Held-to-maturity, Fair Value	$ 6,178

[1] Derived from audited consolidated financial statements.