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Note 13 - Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Available-for-sale debt securities	$ 166,247	$ 280,961	[1]
Derivative assets	168	136
Fair Value, Recurring [Member]
Available-for-sale debt securities	166,247	280,961
Equity securities	55	55
Fair value loans	3,279	3,421
Derivative assets	168	136
Deferred compensation assets	7,464	6,729
Deferred compensation liabilities	9,042	8,282
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	7,464	6,729
Deferred compensation liabilities	9,042	8,282
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale debt securities	166,247	280,961
Equity securities	55	55
Fair value loans	0	0
Derivative assets	168	136
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	3,279	3,421
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	5,750	5,749
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	5,750	5,749
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	36,324	145,826
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	36,324	145,826
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	18,112	19,377
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	18,112	19,377
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	26,916	27,081
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	26,916	27,081
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	79,145	82,928
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	79,145	82,928
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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