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Note 13 - Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Available-for-sale debt securities	$ 275,332	$ 300,349	[1]
Derivative assets	229	199
Fair Value, Recurring [Member]
Available-for-sale debt securities	275,332	300,349
Equity securities	55	55
Fair value loans	3,415	3,784
Derivative assets	229	199
Deferred compensation assets	6,003	5,142
Deferred compensation liabilities	7,527	5,142
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale debt securities	0	0
Equity securities	0	0
Fair value loans	0	0
Derivative assets	0	0
Deferred compensation assets	6,003	5,142
Deferred compensation liabilities	7,527	5,142
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale debt securities	275,332	300,349
Equity securities	55	55
Fair value loans	0	0
Derivative assets	229	199
Deferred compensation assets	0	0
Deferred compensation liabilities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale debt securities	0	0
Equity securities	0	0
Fair value loans	3,415	3,784
Derivative assets	0	0
Deferred compensation assets	0	0
Deferred compensation liabilities	0	0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]
Available-for-sale debt securities	5,741	1,485
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale debt securities	0	0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale debt securities	5,741	1,485
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale debt securities	0	0
Fair Value, Recurring [Member] | US Treasury Securities [Member]
Available-for-sale debt securities	144,920	157,264
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale debt securities	0	0
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale debt securities	144,920	157,264
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale debt securities	0	0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Available-for-sale debt securities	19,401	23,309
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale debt securities	0	0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale debt securities	19,401	23,309
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale debt securities	0	0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Available-for-sale debt securities	26,249	34,857
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale debt securities		0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale debt securities	26,249	34,857
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale debt securities		0
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member]
Available-for-sale debt securities	79,021	83,434
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale debt securities	0	0
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale debt securities	79,021	83,434
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale debt securities	$ 0	$ 0
[1] Derived from audited financial statements

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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