Note 5 - Debt Securities - Summary of Volume of state and Political Subdivision Securities Held to Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Tax-exempt state and political subdivisions	$ 96,640	$ 98,060	[1]
Unrealized Gains	0	3,187
Unrealized Losses	12,555	5
Debt Securities, Held-to-maturity, Fair Value	84,085	$ 101,242	[1]
TEXAS
Tax-exempt state and political subdivisions	15,176
Unrealized Gains	0
Unrealized Losses	1,713
Debt Securities, Held-to-maturity, Fair Value	13,463
CALIFORNIA
Tax-exempt state and political subdivisions	9,718
Unrealized Gains	0
Unrealized Losses	980
Debt Securities, Held-to-maturity, Fair Value	8,738
PENNSYLVANIA
Tax-exempt state and political subdivisions	8,519
Unrealized Gains	0
Unrealized Losses	1,017
Debt Securities, Held-to-maturity, Fair Value	7,502
FLORIDA
Tax-exempt state and political subdivisions	7,498
Unrealized Gains	0
Unrealized Losses	1,183
Debt Securities, Held-to-maturity, Fair Value	6,315
MICHIGAN
Tax-exempt state and political subdivisions	6,937
Unrealized Gains	0
Unrealized Losses	1,003
Debt Securities, Held-to-maturity, Fair Value	$ 5,934

[1] Derived from audited consolidated financial statements